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8-0.72= 0.72×2.5×4= 7.2÷0.8= 0.64÷1.6=
8.7÷2.9×2.9= 4.2÷0.1= 7.2+6.5+2.8= 1.5×0.75+1.5×0.25=
分析:按照计算法则直接进行计算,②⑤⑦⑧可以运用定律进行简算.
解答:
解:8-0.72=7.28 0.72×2.5×4=7.2 7.2÷0.8=9 0.64÷1.6=0.4
8.7÷2.9×2.9=8.7 4.2÷0.1=42 7.2+6.5+2.8=16.5 1.5×0.75+1.5×0.25=1.5
点评:此题考查学生的计算能力,计算时要细心,同时注意个别题使用运算定律可以进行简算.
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