题目内容
9.能简算的要简算.①6.8×0.56+0.44×6.8
②44×2.5×0.9
③7.2÷0.5÷0.2.
分析 (1)利用乘法分配律计算;
(2)把44改写成11×4再利用乘法交换律与结合律计算;
(3)利用除法性质计算.
解答 解:①6.8×0.56+0.44×6.8
=6.8×(0.56+0.44)
=6.8×1
=6.8
②44×2.5×0.9
=11×4×2.5×0.9
=(4×2.5)×11×0.9
=10×9.9
=99
③7.2÷0.5÷0.2
=7.2÷(0.5×0.2)
=7.2÷0.1
=72
点评 考查学生对四则运算法则以及运算定律和性质的掌握情况.
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