题目内容

用脱式计算下面各题,能简算的要简算。
(1)7.6×+×4.7 (2)÷[-(+)]
(3)0.25×+×25% (4)÷75%-×38%
(1)原式=7.6×+7.6×4.7
                =7.6×(5.3+4.7)
                =7.6×10
                =76
 
 
(2)原式=÷(--
                =÷(3-
                =÷
                =
(3)原式=0.25×(+
                =0.25×4
                =1
 
(4)原式=×-×
                 =-
                 =
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