| 直接写出得数 11-1.1= | 1.26÷0.3= | 12.5× = | 13÷39= | 1.5×0.2= |
87.5%× = | 2- = | = | 8.9×11-8.9= | = |
6× = | = |
| 解:11-1.1=9.9, | 1.26÷0.3=4.2, | 12.5× =10, | 13÷39= , | 1.5×0.2=0.3, |
87.5%× = , | 2- = , | = , | 8.9×11-8.9=89, | = , |
6× =12 , | = . |
分析:(1)--(8)小题根据整数、分数、小数的四则运算的法则直接求解;
(9)8.9×11-8.9改写成8.9×(11-1),运用乘法分配律简算;
(10)按照先算乘法,再算加法的顺序计算;
(11)6×
改写成6×
+6×2,运用乘法分配律简算;(12)
改写成
×
×
,先约分,再计算.点评:本题考查了基本的运算,要注意分析数据,选择合适的简算方法计算.
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