题目内容
【题目】下面各题,能简算的要简算。
8.57-(3.57+0.29)
13.2÷[14.7-(1.6+2.1)]
5.7×9.8+0.57+0.57
1.25×3.2×2.5
【答案】8.57-(3.57+0.29)
=8.57-3.57-0.29
=5-0.29
=4.71
13.2÷[14.7-(1.6+2.1)]
=13.2÷[14.7-3.7]
=13.2÷11
=1.2
5.7×9.8+0.57+0.57
=5.7×9.8+0.57×2
=5.7×(9.8+0.2)
=5.7×10
=57
1.25×3.2×2.5
=(1.25×0.8)×(4×2.5)
=1×10
=10
【解析】略
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