问题 计算题
脱等式计算(能简算的要简算)。
(1)15.4÷0.4÷1.4+7.9(2)(0.45×6.38+0.45×3.62)÷0.5
(3)0.25×3.8×40(4)89.3×43+38×89.3+99.3×1.9
答案

(1)原式=38.5÷1.4+7.9

                =27.5+7.9

                =35.4(2)原式=0.45×(6.38+3.62)÷0.5

                = 4.5÷0.5

                =9

(3)原式=0.25×40×3.8

                =10×3.8

                =38(4)原式=89.3×(43+38)+99.3×1.9

                =7233.3+188.67

                =7421.97

单项选择题
单项选择题