位置與坐標(biāo)

變化的魚位置與坐標(biāo)

變化的魚1123456780–1–2–3–4–512349105在直角坐標(biāo)系中描出以下各點(diǎn)：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)并用線段依次連接，看一看是什么圖案。

yx第3節(jié)變化的魚123456780–1–2–3–4–512349105在直角2123456780–1–2–3–4–512349105圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的則坐標(biāo)變化為縱坐標(biāo)保持不變，將各坐標(biāo)的橫坐標(biāo)加２又會(huì)怎樣？yx原圖形被向右平移2個(gè)單位(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(x+2,y)(2,0)(7,4)(5,0)(7,1)(7,-1)(5,0)(6,-2)(2,0)123456780–1–2–3–4–512349105圖中的3123456780–1–2–3–4–512349105圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的則坐標(biāo)變化為：縱坐標(biāo)保持不變，將各坐標(biāo)的橫坐標(biāo)減２，圖案會(huì)變成什么樣？yx-1-2猜一猜原圖形被向左平移2個(gè)單位(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(x-2,y)(-２,0)(3,4)(1,0)(3,1)(3,-1)(1,0)(2,-2)(-2,0)123456780–1–2–3–4–512349105圖中的4123456780–1–2–3–4–512345圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的橫坐標(biāo)保持不變，將各坐標(biāo)的縱坐標(biāo)都加２，則原圖型變?yōu)槭裁礃樱縴x猜一猜原圖形被向上平移2個(gè)單位123456780–1–2–3–4–512345圖中的魚是將5縱坐標(biāo)保持不變，將各坐標(biāo)的橫坐標(biāo)變成原來(lái)的２倍會(huì)得到什么？圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的右圖中的直角三角形頂點(diǎn)的坐標(biāo)發(fā)生怎樣變化。原圖形的形狀沒(méi)變，面積是原來(lái)的4倍。與左圖三角形相比，右圖中的三角形發(fā)生了怎樣變化。原圖形被向上平移2個(gè)單位圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的與左圖三角形相比，右圖中的三角形發(fā)生了怎樣變化。與左圖三角形相比，右圖中的三角形發(fā)生了怎樣變化。為原來(lái)的a倍（a>1）…橫坐標(biāo)保持不變，將各坐標(biāo)的縱坐標(biāo)都減１，則原圖型變?yōu)槭裁礃樱繉⒏髯鴺?biāo)的縱坐標(biāo)保持不變，橫坐標(biāo)都乘以－１，圖形會(huì)變成什么樣？原圖形被向上平移2個(gè)單位為原來(lái)的a倍（a>1）縱坐標(biāo)不變，橫坐標(biāo)分別乘-1，所得圖形與圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的右圖中的直角三角形頂點(diǎn)的坐標(biāo)發(fā)生怎樣變化。圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的如果橫坐標(biāo)與縱坐標(biāo)同時(shí)乘以２，那么所得圖案又會(huì)發(fā)生什么變化?橫坐標(biāo)不變，縱坐標(biāo)分別變?yōu)樵瓉?lái)的a倍，則圖形123456780–1–2–3–4–512345圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的橫坐標(biāo)保持不變，將各坐標(biāo)的縱坐標(biāo)都減１，則原圖型變?yōu)槭裁礃?？yx猜一猜原圖形被向下平移1個(gè)單位縱坐標(biāo)保持不變，將各坐標(biāo)的橫坐標(biāo)變成原來(lái)的２倍會(huì)得到什么？16123456780–1–2–3–4–512349105在直角坐標(biāo)系中描出以下各點(diǎn)：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)并用線段依次連接,看一看是什么圖案.

yx圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的縱坐標(biāo)保持不變，將各坐標(biāo)的橫坐標(biāo)變成原來(lái)的２倍會(huì)得到什么？則坐標(biāo)變化為：原圖形被橫向拉伸2倍(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(2x,y)(0,0)(10,4)(6,0)(10,1)(10,-1)(6,0)(8,-2)(0,0)123456780–1–2–3–4–512349105在直角7123456780–1–2–3–4–512349105圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的縱坐標(biāo)保持不變,將各坐標(biāo)的橫坐標(biāo)變成原來(lái)的1/2，圖形會(huì)怎么變？則坐標(biāo)變化為：yx原圖形被橫向壓縮1/2(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(x/2,y)(0,0)(2.5,4)(1.5,0)(2.5,1)(2.5,-1)(1.5,0)(2,-2)(0,0)123456780–1–2–3–4–512349105圖中的8–4123456780–1–2–361234578910xy圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的如果橫坐標(biāo)保持不變，縱坐標(biāo)變成原來(lái)的２倍，那么所得圖案又會(huì)發(fā)生什么變化?猜一猜原圖形被縱向拉伸２倍–4123456780–1–2–361234578910xy9–4123456780–1–2–361234578910xy圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的如果橫坐標(biāo)保持不變，縱坐標(biāo)變成原來(lái)的?，那么所得圖案又會(huì)發(fā)生什么變化?猜一猜原圖形被縱向壓縮1/2–4123456780–1–2–361234578910xy1012345-1-2-30–1–2–3–4–51234-4-55圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的yx想一想與原圖形關(guān)于y軸對(duì)稱將各坐標(biāo)的縱坐標(biāo)保持不變，橫坐標(biāo)都乘以－１，圖形會(huì)變成什么樣？則坐標(biāo)變化為(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(-x,y)(0,0)(-5,4)(-3,0)(-5,1)(-5,-1)(-3,0)(-2,-2)(0,0)12345-1-2-30–1–2–3–4–51234-4-511123456780–1–2–3–4–512345圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的將各坐標(biāo)的縱坐標(biāo)都乘以－1，橫坐標(biāo)保持不變，則圖形怎么變化？坐標(biāo)變化為yx猜一猜與原圖形關(guān)于x軸對(duì)稱(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(x,-y)(0,0)(5,-4)(3,0)(5,-1)(5,1)(3,0)(4,2)(0,0)123456780–1–2–3–4–512345圖中的魚是將12–5圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的將各坐標(biāo)的縱坐標(biāo)與橫坐標(biāo)都乘以－1，圖形會(huì)變成什么樣？yx234510–1–2–3–412345–1–2–3–4–5原坐標(biāo)變?yōu)?0,0)(-5，-4)(-3,0)(-5,-1)(-5,1)(-3,0)(-4,2)(0,0)猜想與原圖形關(guān)于原點(diǎn)中心對(duì)稱(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(-x,-y)(0,0)(-5,-4)(-3,0)(-5,-1)(-5,1)(-3,0)(-4,2)(0,0)–5圖中的魚是將坐標(biāo)為：(0,0)(5,4)(13–4123456780–1–2–361234578910xy1.圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的如果橫坐標(biāo)與縱坐標(biāo)同時(shí)乘以２，那么所得圖案又會(huì)發(fā)生什么變化?

原坐標(biāo)變?yōu)椋涸瓐D形被橫向、縱向各拉伸2倍原圖形的形狀沒(méi)變，面積是原來(lái)的4倍。(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(2x,2y)(0,0)(10,8)(6,0)(10,2)(10,-2)(6,0)(8,-4)(0,0)–4123456780–1–2–361234578910xy14一、平移1.縱坐標(biāo)不變，橫坐標(biāo)分別增加（減少）a個(gè)單位時(shí)，圖形

平移a個(gè)單位；2.橫坐標(biāo)不變，縱坐標(biāo)分別增加（減少）a個(gè)單位時(shí)，圖形

平移a個(gè)單位；向右（向左）向上（向下）二、伸長(zhǎng)（壓縮）3.縱坐標(biāo)不變，橫坐標(biāo)分別變?yōu)樵瓉?lái)的a倍，則圖形

為原來(lái)的a倍（a>1）4.橫坐標(biāo)不變，縱坐標(biāo)分別變?yōu)樵瓉?lái)的a倍，則圖形

為原來(lái)的a倍（a>1）5.橫坐標(biāo)與縱坐標(biāo)同時(shí)變?yōu)樵瓉?lái)的a倍，則圖形

為原來(lái)的a倍（a>1）…橫向伸長(zhǎng)或圖形橫向壓縮為原來(lái)的a倍（0<a<1）。

縱向伸長(zhǎng)或圖形縱向壓縮為原來(lái)的a倍（0<a<1）。縱、橫向同時(shí)伸長(zhǎng)一、平移向右（向左）向上（向下）二、伸長(zhǎng)（壓縮）橫向伸長(zhǎng)或圖15三、軸對(duì)稱6.縱坐標(biāo)不變，橫坐標(biāo)分別乘-1，所得圖形與原圖形關(guān)于

；7.橫坐標(biāo)不變，縱坐標(biāo)分別乘-1，所得圖形與原圖形關(guān)于

；Y軸對(duì)稱X軸對(duì)稱原點(diǎn)四、中心對(duì)稱8.橫坐標(biāo)與縱坐標(biāo)都乘-1，所得圖形與原圖形關(guān)于

中心對(duì)稱。三、軸對(duì)稱Y軸對(duì)稱X軸對(duì)稱原點(diǎn)四、中心對(duì)稱16123410432–2–1–1–2–3–4–3–4123410432–2–1–1–2–3–4–3–4練一練與左圖三角形相比，右圖中的三角形發(fā)生了怎樣變化。右圖中的直角三角形頂點(diǎn)的坐標(biāo)發(fā)生怎樣變化。123410432–2–1–1–2–3–4–3–41234117123410432–2–1–1–2–3–4–3–4123410432–2–1–1–2–3–4–3–4練一練與左圖三角形相比，右圖中的三角形發(fā)生了怎樣變化。右圖中的直角三角形頂點(diǎn)的坐標(biāo)發(fā)生怎樣變化。123410432–2–1–1–2–3–4–3–41234118123410432–2–1–1–2–3–4–3–4123410432–2–1–1–2–3–4–3–4練一練與左圖三角形相比，右圖中的三角形發(fā)生了怎樣變化。右圖中的直角三角形頂點(diǎn)的坐標(biāo)發(fā)生怎樣變化。123410432–2–1–1–2–3–4–3–41234119原圖形的形狀沒(méi)變，面積是原來(lái)的4倍。與左圖三角形相比，右圖中的三角形發(fā)生了怎樣變化。如果橫坐標(biāo)與縱坐標(biāo)同時(shí)乘以２，那么所得圖案又會(huì)發(fā)生什么變化?原圖形關(guān)于；在直角坐標(biāo)系中描出以下各點(diǎn)：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)并用線段依次連接，看一看是什么圖案。橫坐標(biāo)不變，縱坐標(biāo)分別乘-1，所得圖形與原圖形被向下平移1個(gè)單位圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的在直角坐標(biāo)系中描出以下各點(diǎn)：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)并用線段依次連接，看一看是什么圖案。為原來(lái)的a倍（a>1）右圖中的直角三角形頂點(diǎn)的坐標(biāo)發(fā)生怎樣變化。右圖中的直角三角形頂點(diǎn)的坐標(biāo)發(fā)生怎樣變化。橫坐標(biāo)保持不變，將各坐標(biāo)的縱坐標(biāo)都加２，則原圖型變?yōu)槭裁礃?？圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的橫坐標(biāo)不變，縱坐標(biāo)分別變?yōu)樵瓉?lái)的a倍，則圖形在直角坐標(biāo)系中描出以下各點(diǎn)：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)并用線段依次連接,看一看是什么圖案.與左圖三角形相比，右圖中的三角形發(fā)生了怎樣變化。與左圖三角形相比，右圖中的三角形發(fā)生了怎樣變化。將各坐標(biāo)的縱坐標(biāo)保持不變，橫坐標(biāo)都乘以－１，圖形會(huì)變成什么樣？原圖形關(guān)于；123410432–2–1–1–2–3–4–3–4123410432–2–1–1–2–3–4–3–4練一練與左圖三角形相比，右圖中的三角形發(fā)生了怎樣變化。右圖中的直角三角形頂點(diǎn)的坐標(biāo)發(fā)生怎樣變化。原圖形的形狀沒(méi)變，面積是原來(lái)的4倍。123410432–2–20橫坐標(biāo)保持不變，將各坐標(biāo)的縱坐標(biāo)都加２，則原圖型變?yōu)槭裁礃?？右圖中的直角三角形頂點(diǎn)的坐標(biāo)發(fā)生怎樣變化。橫坐標(biāo)保持不變，將各坐標(biāo)的縱坐標(biāo)都加２，則原圖型變?yōu)槭裁礃?？與左圖三角形相比，右圖中的三角形發(fā)生了怎樣變化。右圖中的直角三角形頂點(diǎn)的坐標(biāo)發(fā)生怎樣變化。圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的原圖形的形狀沒(méi)變，面積是原來(lái)的4倍。原圖形關(guān)于；縱坐標(biāo)不變，橫坐標(biāo)分別增加（減少）a個(gè)單位時(shí)，圖形平移a個(gè)單位；右圖中的直角三角形頂點(diǎn)的坐標(biāo)發(fā)生怎樣變化。圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的與左圖三角形相比，右圖中的三角形發(fā)生了怎樣變化。圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的橫坐標(biāo)不變，縱坐標(biāo)分別變?yōu)樵瓉?lái)的a倍，則圖形或圖形縱向壓縮為原來(lái)的a倍（0<a<1）?；驁D形橫向壓縮為原來(lái)的a倍（0<a<1）。將各坐標(biāo)的縱坐標(biāo)保持不變，橫坐標(biāo)都乘以－１，圖形會(huì)變成什么樣？原圖形被橫向壓縮1/2圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的123410432–2–1–1–2–3–4–3–4123410432–2–1–1–2–3–4–3–4練一練與左圖三角形相比，右圖中的三角形發(fā)生了怎樣變化。右圖中的直角三角形頂點(diǎn)的坐標(biāo)發(fā)生怎樣變化。橫坐標(biāo)保持不變，將各坐標(biāo)的縱坐標(biāo)都加２，則原圖型變?yōu)槭裁礃?1–4123456780–1–2–361234578910xy如果橫坐標(biāo)乘以２再減去1，縱坐標(biāo)不變，那么所得圖案會(huì)發(fā)生什么變化?延伸–4123456780–1–2–361234578910xy22作業(yè)P1433、4作業(yè)P14323位置與坐標(biāo)

變化的魚位置與坐標(biāo)

變化的魚24123456780–1–2–3–4–512349105在直角坐標(biāo)系中描出以下各點(diǎn)：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)并用線段依次連接，看一看是什么圖案。

yx第3節(jié)變化的魚123456780–1–2–3–4–512349105在直角25123456780–1–2–3–4–512349105圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的則坐標(biāo)變化為縱坐標(biāo)保持不變，將各坐標(biāo)的橫坐標(biāo)加２又會(huì)怎樣？yx原圖形被向右平移2個(gè)單位(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(x+2,y)(2,0)(7,4)(5,0)(7,1)(7,-1)(5,0)(6,-2)(2,0)123456780–1–2–3–4–512349105圖中的26123456780–1–2–3–4–512349105圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的則坐標(biāo)變化為：縱坐標(biāo)保持不變，將各坐標(biāo)的橫坐標(biāo)減２，圖案會(huì)變成什么樣？yx-1-2猜一猜原圖形被向左平移2個(gè)單位(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(x-2,y)(-２,0)(3,4)(1,0)(3,1)(3,-1)(1,0)(2,-2)(-2,0)123456780–1–2–3–4–512349105圖中的27123456780–1–2–3–4–512345圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的橫坐標(biāo)保持不變，將各坐標(biāo)的縱坐標(biāo)都加２，則原圖型變?yōu)槭裁礃樱縴x猜一猜原圖形被向上平移2個(gè)單位123456780–1–2–3–4–512345圖中的魚是將28縱坐標(biāo)保持不變，將各坐標(biāo)的橫坐標(biāo)變成原來(lái)的２倍會(huì)得到什么？圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的右圖中的直角三角形頂點(diǎn)的坐標(biāo)發(fā)生怎樣變化。原圖形的形狀沒(méi)變，面積是原來(lái)的4倍。與左圖三角形相比，右圖中的三角形發(fā)生了怎樣變化。原圖形被向上平移2個(gè)單位圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的與左圖三角形相比，右圖中的三角形發(fā)生了怎樣變化。與左圖三角形相比，右圖中的三角形發(fā)生了怎樣變化。為原來(lái)的a倍（a>1）…橫坐標(biāo)保持不變，將各坐標(biāo)的縱坐標(biāo)都減１，則原圖型變?yōu)槭裁礃?？將各坐?biāo)的縱坐標(biāo)保持不變，橫坐標(biāo)都乘以－１，圖形會(huì)變成什么樣？原圖形被向上平移2個(gè)單位為原來(lái)的a倍（a>1）縱坐標(biāo)不變，橫坐標(biāo)分別乘-1，所得圖形與圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的右圖中的直角三角形頂點(diǎn)的坐標(biāo)發(fā)生怎樣變化。圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的如果橫坐標(biāo)與縱坐標(biāo)同時(shí)乘以２，那么所得圖案又會(huì)發(fā)生什么變化?橫坐標(biāo)不變，縱坐標(biāo)分別變?yōu)樵瓉?lái)的a倍，則圖形123456780–1–2–3–4–512345圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的橫坐標(biāo)保持不變，將各坐標(biāo)的縱坐標(biāo)都減１，則原圖型變?yōu)槭裁礃樱縴x猜一猜原圖形被向下平移1個(gè)單位縱坐標(biāo)保持不變，將各坐標(biāo)的橫坐標(biāo)變成原來(lái)的２倍會(huì)得到什么？129123456780–1–2–3–4–512349105在直角坐標(biāo)系中描出以下各點(diǎn)：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)并用線段依次連接,看一看是什么圖案.

yx圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的縱坐標(biāo)保持不變，將各坐標(biāo)的橫坐標(biāo)變成原來(lái)的２倍會(huì)得到什么？則坐標(biāo)變化為：原圖形被橫向拉伸2倍(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(2x,y)(0,0)(10,4)(6,0)(10,1)(10,-1)(6,0)(8,-2)(0,0)123456780–1–2–3–4–512349105在直角30123456780–1–2–3–4–512349105圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的縱坐標(biāo)保持不變,將各坐標(biāo)的橫坐標(biāo)變成原來(lái)的1/2，圖形會(huì)怎么變？則坐標(biāo)變化為：yx原圖形被橫向壓縮1/2(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(x/2,y)(0,0)(2.5,4)(1.5,0)(2.5,1)(2.5,-1)(1.5,0)(2,-2)(0,0)123456780–1–2–3–4–512349105圖中的31–4123456780–1–2–361234578910xy圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的如果橫坐標(biāo)保持不變，縱坐標(biāo)變成原來(lái)的２倍，那么所得圖案又會(huì)發(fā)生什么變化?猜一猜原圖形被縱向拉伸２倍–4123456780–1–2–361234578910xy32–4123456780–1–2–361234578910xy圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的如果橫坐標(biāo)保持不變，縱坐標(biāo)變成原來(lái)的?，那么所得圖案又會(huì)發(fā)生什么變化?猜一猜原圖形被縱向壓縮1/2–4123456780–1–2–361234578910xy3312345-1-2-30–1–2–3–4–51234-4-55圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的yx想一想與原圖形關(guān)于y軸對(duì)稱將各坐標(biāo)的縱坐標(biāo)保持不變，橫坐標(biāo)都乘以－１，圖形會(huì)變成什么樣？則坐標(biāo)變化為(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(-x,y)(0,0)(-5,4)(-3,0)(-5,1)(-5,-1)(-3,0)(-2,-2)(0,0)12345-1-2-30–1–2–3–4–51234-4-534123456780–1–2–3–4–512345圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的將各坐標(biāo)的縱坐標(biāo)都乘以－1，橫坐標(biāo)保持不變，則圖形怎么變化？坐標(biāo)變化為yx猜一猜與原圖形關(guān)于x軸對(duì)稱(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(x,-y)(0,0)(5,-4)(3,0)(5,-1)(5,1)(3,0)(4,2)(0,0)123456780–1–2–3–4–512345圖中的魚是將35–5圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的將各坐標(biāo)的縱坐標(biāo)與橫坐標(biāo)都乘以－1，圖形會(huì)變成什么樣？yx234510–1–2–3–412345–1–2–3–4–5原坐標(biāo)變?yōu)?0,0)(-5，-4)(-3,0)(-5,-1)(-5,1)(-3,0)(-4,2)(0,0)猜想與原圖形關(guān)于原點(diǎn)中心對(duì)稱(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(-x,-y)(0,0)(-5,-4)(-3,0)(-5,-1)(-5,1)(-3,0)(-4,2)(0,0)–5圖中的魚是將坐標(biāo)為：(0,0)(5,4)(36–4123456780–1–2–361234578910xy1.圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的如果橫坐標(biāo)與縱坐標(biāo)同時(shí)乘以２，那么所得圖案又會(huì)發(fā)生什么變化?

原坐標(biāo)變?yōu)椋涸瓐D形被橫向、縱向各拉伸2倍原圖形的形狀沒(méi)變，面積是原來(lái)的4倍。(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(2x,2y)(0,0)(10,8)(6,0)(10,2)(10,-2)(6,0)(8,-4)(0,0)–4123456780–1–2–361234578910xy37一、平移1.縱坐標(biāo)不變，橫坐標(biāo)分別增加（減少）a個(gè)單位時(shí)，圖形

平移a個(gè)單位；2.橫坐標(biāo)不變，縱坐標(biāo)分別增加（減少）a個(gè)單位時(shí)，圖形

平移a個(gè)單位；向右（向左）向上（向下）二、伸長(zhǎng)（壓縮）3.縱坐標(biāo)不變，橫坐標(biāo)分別變?yōu)樵瓉?lái)的a倍，則圖形

為原來(lái)的a倍（a>1）4.橫坐標(biāo)不變，縱坐標(biāo)分別變?yōu)樵瓉?lái)的a倍，則圖形

為原來(lái)的a倍（a>1）5.橫坐標(biāo)與縱坐標(biāo)同時(shí)變?yōu)樵瓉?lái)的a倍，則圖形

為原來(lái)的a倍（a>1）…橫向伸長(zhǎng)或圖形橫向壓縮為原來(lái)的a倍（0<a<1）。

縱向伸長(zhǎng)或圖形縱向壓縮為原來(lái)的a倍（0<a<1）?？v、橫向同時(shí)伸長(zhǎng)一、平移向右（向左）向上（向下）二、伸長(zhǎng)（壓縮）橫向伸長(zhǎng)或圖38三、軸對(duì)稱6.縱坐標(biāo)不變，橫坐標(biāo)分別乘-1，所得圖形與原圖形關(guān)于

；7.橫坐標(biāo)不變，縱坐標(biāo)分別乘-1，所得圖形與原圖形關(guān)于

；Y軸對(duì)稱X軸對(duì)稱原點(diǎn)四、中心對(duì)稱8.橫坐標(biāo)與縱坐標(biāo)都乘-1，所得圖形與原圖形關(guān)于

中心對(duì)稱。三、軸對(duì)稱Y軸對(duì)稱X軸對(duì)稱原點(diǎn)四、中心對(duì)稱39123410432–2–1–1–2–3–4–3–4123410432–2–1–1–2–3–4–3–4練一練與左圖三角形相比，右圖中的三角形發(fā)生了怎樣變化。右圖中的直角三角形頂點(diǎn)的坐標(biāo)發(fā)生怎樣變化。123410432–2–1–1–2–3–4–3–41234140123410432–2–1–1–2–3–4–3–4123410432–2–1–1–2–3–4–3–4練一練與左圖三角形相比，右圖中的三角形發(fā)生了怎樣變化。右圖中的直角三角形頂點(diǎn)的坐標(biāo)發(fā)生怎樣變化。123410432–2–1–1–2–3–4–3–41234141123410432–2–1–1–2–3–4–3–4123410432–2–1–1–2–3–4–3–4練一練與左圖三角形相比，右圖中的三角形發(fā)生了怎樣變化。右圖中的直角三角形頂點(diǎn)的坐標(biāo)發(fā)生怎樣變化。123410432–2–1–1–2–3–4–3–41234142原圖形的形狀沒(méi)變，面積是原來(lái)的4倍。與左圖三角形相比，右圖中的三角形發(fā)生了怎樣變化。如果橫坐標(biāo)與縱坐標(biāo)同時(shí)乘以２，那么所得圖案又會(huì)發(fā)生什么變化?原圖形關(guān)于；在直角坐標(biāo)系中描出以下各點(diǎn)：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)并用線段依次連接，看一看是什么圖案。橫坐標(biāo)不變，縱坐標(biāo)分別乘-1，所得圖形與原圖形被向下平移1個(gè)單位圖中的魚是將坐標(biāo)為：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的點(diǎn)用線段依次連接而成的在直角坐標(biāo)系中描出以下各點(diǎn)：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)并用線段依次連接，看一看是什么圖案。為原來(lái)的a倍（a>1）右圖中的直角三角形頂點(diǎn)的坐標(biāo)發(fā)生怎樣變化