问题
计算题
脱式计算，能简算的要简算。
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答案
解：
18.9×9.9
=18.9×（1-0.1）
=18.9-1.89
=17.01
12.5×9.94×0.8
=12.5×0.8×9.94
=10×9.94
=99.4
48÷5÷0.6
=48÷0.6÷5
=80÷5
=16
6.8×32+32×3.2
=32×（6.8+3.2）
=320
50×0.837×0.2
=50×0.2×0.837
=10×0.837
=8.37
7.28+3.2÷2.5
=7.28+1.28
=8.56