1、歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,排列、組合,簡(jiǎn)單的推理,冀教版二年級(jí)數(shù)學(xué)下冊(cè),歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,學(xué)習(xí)目標(biāo),學(xué)會(huì)簡(jiǎn)單的排列組合問題； 會(huì)自行組合簡(jiǎn)單的圖形； 挖掘現(xiàn)成圖形的規(guī)律。,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,用 2、5 兩個(gè)數(shù)字能組成幾個(gè)兩位數(shù)？試試看。,2,5,5,2,兩個(gè),歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,1

2、,用 1、2、5 三個(gè)數(shù)字能組成幾個(gè)三位數(shù)？ 再試試看。,1,2,5,2,1,5,5,2,1,5,2,2,5,1,1,2,5,六個(gè),歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,如果 1、2、5 三個(gè)數(shù)字中的1換成0，能組成幾個(gè)三位數(shù)？再試試看。,答案,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,0,2,5,2,0,5,5,2,0,0,5,2,2,5,0,5,0,2,如果 1、2、5 三個(gè)數(shù)字把1換成0，能組成幾個(gè)三位數(shù)？再試試看。,不是三位數(shù),四個(gè),歡迎來訪，敬請(qǐng)指導(dǎo)thank yo

3、u!thank you!thank you!thank you!,如果 每?jī)蓚€(gè)人握一次手，三個(gè)人握幾次手？,1次,2次,3次,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,買一個(gè)5角拼音本，可以怎樣付錢？,答案,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,付法一,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,付法二,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,付法三,歡迎來訪，

4、敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,付法四,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,有幾種穿法？,答案,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,穿法一,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,穿法二,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,穿法三,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!

5、thank you!thank you!,穿法四,返回,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,兩只小貓釣魚比賽，猜猜誰贏了？,輸 了,贏 了,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,在下列正方形的下面有紅、黃、粉三種花，猜猜它們分別是什么顏色的花？,我不是紅花,我是粉花,答案,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,在下列正方形的下面有紅、黃、粉三種花，根據(jù)已知條件猜猜它們分別是什么顏色的花？,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,有紅、黑、花三條金魚，根據(jù)所給條件猜猜誰先游出來？,1.最先游出來的不是花金魚。,2.黑金魚在最后。,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,看答案,1、最先游出來的不是花金魚。,2、黑金魚在最后。,有紅、黑、花三條金魚，根據(jù)所給條件猜猜誰先游出來？,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,有紅、黑、花三條金魚，根據(jù)所給條件猜猜誰先游出來？,你