题目内容

【题目】用简算方法计算下面各题.

112.5×0.7×0.8

24.2×8+8×5.8

325﹣1.25

【答案】112.5×0.7×0.8

=12.5×0.8×0.7

=10×0.7

=7

24.2×8+8×5.8

=4.2+5.8×8

=10×8

=80

325﹣1.25

=8×25﹣1.25×8

=200﹣10

=190

【解析】解:(112.5×0.7×0.8

=12.5×0.8×0.7

=10×0.7

=7

24.2×8+8×5.8

=4.2+5.8×8

=10×8

=80

325﹣1.25

=8×25﹣1.25×8

=200﹣10

=190

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