初一判斷大小的題目及答案

單項(xiàng)選擇題(每題2分,共10題)1.比較\(-3\)和\(-2\)的大小,正確的是（）A.\(-3>-2\)B.\(-3<-2\)C.\(-3=-2\)D.無法比較答案:B2.下列各組數(shù)中,大小關(guān)系正確的是()A.\(-5>-4\)B.\(|-3|<|-2|\)C.\(-(-2)<-|2|\)D.\(-\frac{1}{2}>-\frac{1}{3}\)答案:B3.比較\(0\)和\(-0.5\)的大小,正確的是()A.\(0>-0.5\)B.\(0<-0.5\)C.\(0=-0.5\)D.無法比較答案:A4.下列各數(shù)中,最小的數(shù)是()A.\(-1\)B.\(0\)C.\(1\)D.\(-2\)答案:D5.比較\(\frac{3}{4}\)和\(\frac{2}{3}\)的大小,正確的是()A.\(\frac{3}{4}>\frac{2}{3}\)B.\(\frac{3}{4}<\frac{2}{3}\)C.\(\frac{3}{4}=\frac{2}{3}\)D.無法比較答案:A6.下列各組數(shù)中,最大的數(shù)是()A.\(-10\)B.\(-1\)C.\(0\)D.\(5\)答案:D7.比較\(-1.5\)和\(-1.2\)的大小,正確的是()A.\(-1.5>-1.2\)B.\(-1.5<-1.2\)C.\(-1.5=-1.2\)D.無法比較答案:B8.下列各數(shù)中,比\(-3\)小的數(shù)是()A.\(-4\)B.\(-2\)C.\(0\)D.\(1\)答案:A9.比較\(-\frac{2}{5}\)和\(-\frac{1}{3}\)的大小,正確的是()A.\(-\frac{2}{5}>-\frac{1}{3}\)B.\(-\frac{2}{5}<-\frac{1}{3}\)C.\(-\frac{2}{5}=-\frac{1}{3}\)D.無法比較答案:B10.下列數(shù)中,大于\(-2\)且小于\(1\)的數(shù)是()A.\(-3\)B.\(0\)C.\(2\)D.\(-1.5\)答案:B多項(xiàng)選擇題(每題2分,共10題)1.下列說法正確的有(）A.正數(shù)大于\(0\)B.負(fù)數(shù)小于\(0\)C.正數(shù)大于負(fù)數(shù)D.兩個(gè)負(fù)數(shù)比較,絕對值大的反而小答案:ABCD2.下列各組數(shù)中,大小關(guān)系正確的有()A.\(-5<-3\)B.\(|-4|>|-3|\)C.\(-(-2)>-2\)D.\(-\frac{1}{4}>-\frac{1}{2}\)答案:ABCD3.下列數(shù)中,比\(-1\)大的數(shù)有()A.\(0\)B.\(-0.5\)C.\(-2\)D.\(1\)答案:ABD4.關(guān)于數(shù)的大小比較,正確的是()A.所有正數(shù)都大于負(fù)數(shù)B.所有負(fù)數(shù)都小于\(0\)C.兩個(gè)正數(shù)比較,絕對值大的數(shù)大D.兩個(gè)負(fù)數(shù)比較,絕對值小的數(shù)小答案:ABC5.下列數(shù)中,小于\(2\)的數(shù)有()A.\(1\)B.\(-1\)C.\(0\)D.\(3\)答案:ABC判斷題(每題2分,共10題)1.正數(shù)一定大于負(fù)數(shù)。(√)2.\(-5\)比\(-3\)大。(×)3.\(0\)大于所有負(fù)數(shù)。(√)4.兩個(gè)數(shù)比較大小,絕對值大的數(shù)就大。（×)5.\(-\frac{1}{2}>-\frac{1}{3}\)。(×)6.負(fù)數(shù)都小于\(0\)。(√)7.\(3\)比\(-2\)大。(√)8.\(-0.1\)比\(-0.01\)小。(√)9.所有正數(shù)都大于\(0\),所有負(fù)數(shù)都小于\(0\)。(√）10.兩個(gè)負(fù)數(shù),絕對值小的數(shù)反而大。（√）簡答題(每題5分,共4題)1.比較\(-4\)和\(-3\)的大小,并說明理由。答案：\(-4<-3\),因?yàn)閮蓚€(gè)負(fù)數(shù)比較,絕對值大的反而小,\(|-4|=4\),\(|-3|=3\),\(4>3\),所以\(-4<-3\)。2.比較\(0.5\)和\(-0.6\)的大小,并說明理由。答案：\(0.5>-0.6\),因?yàn)檎龜?shù)大于負(fù)數(shù)。3.比較\(-\frac{2}{3}\)和\(-\frac{3}{4}\)的大小。答案:\(-\frac{2}{3}>-\frac{3}{4}\),因?yàn)閈(\left|-\frac{2}{3}\right|=\frac{2}{3}=\frac{8}{12}\),\(\left|-\frac{3}{4}\right|=\frac{3}{4}=\frac{9}{12}\),\(\frac{8}{12}<\frac{9}{12}\),所以\(-\frac{2}{3}>-\frac{3}{4}\)。4.比較\(-1.25\)和\(-1\frac{1}{4}\)的大小。答案:\(-1.25=-1\frac{1}{4}\),因?yàn)閈(-1\frac{1}{4}=-1.25\),所以兩者相等。討論題(每題5分,共4題)1.說一說比較兩個(gè)負(fù)數(shù)大小的方法。答案:比較兩個(gè)負(fù)數(shù)大小,先求絕對值,絕對值大的負(fù)數(shù)反而小。2.舉例說明正數(shù)、負(fù)數(shù)和\(0\)之間的大小關(guān)系。答案:例如\(3\)是正數(shù)大于\(0\);\(-2\)是負(fù)數(shù)小于\(