问题 计算题
计算下面各题,能简算的用简便方法计算。
18.9×9.912.5×8.94×0.87.4×0.5+7.4÷0.5
4.92÷2.46.8×32+32×3.2(8.1-5.6)÷0.8+7.75
5.92×2.55.6×(12.5-8.5÷0.85)3.5×[13-(3.12+5.28)]
答案
18.9×9.9
=18.9×(10-0.1)
=189-1.89
=187.1112.5×8.94×0.8
=(12.5×0.8)×8.94
=10×8.94
=89.47.4×0.5+7.4÷0.5
=7.4×(0.5+2)
=7.4×2.5
=18.5
4.92÷2.4

=2.056.8×32+32×3.2

=32×(6.8+3.2)

=320(8.1-5.6)÷0.8+7.75

=2.5÷0.8+7.75

=10.875

5.92×2.5

=14.85.6×(12.5-8.5÷0.85)

=5.6×2.5

=5.6÷0.4

=143.5×[13-(3.12+5.28)]

=3.5×(13-8.4)

=3.5×4.6

=16.1

解答题
单项选择题