问题
计算题
计算下面各题,能简算的用简便方法计算。 | |||||||||
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答案
18.9×9.9 | |
=18.9×(10-0.1) | |
=189-1.89 | |
=187.11 | 12.5×8.94×0.8 |
=(12.5×0.8)×8.94 | |
=10×8.94 | |
=89.4 | 7.4×0.5+7.4÷0.5 |
=7.4×(0.5+2) | |
=7.4×2.5 | |
=18.5 | |
4.92÷2.4 |
=2.05
=32×(6.8+3.2)
=320
=2.5÷0.8+7.75
=10.875
5.92×2.5
=14.8
=5.6×2.5
=5.6÷0.4
=14
=3.5×(13-8.4)
=3.5×4.6
=16.1