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0.125+ = 3.6× = 4.2+8= × =
15÷0.01= 6÷ = 0.32= ×9=
小刚家一个月总用电200千瓦时,峰时用电量与谷时用电量的比是2:3,小刚家这个月谷时电费是多少元?
1-0.92= - = ×3.2= ÷ ×5=
3.5+4.28= × = ÷ = 99×0.9+0.9=