题目

脱式计算(能简算的要简算) (1) 1 ×( - )÷ ×3 (2) ( + )×12×15 (3) ( + )×8+ (4) 75×87.5%+24×+0.875 答案: 解:123×(12-13)÷16×3 =123×16÷16×3 =(123×3)×(16×16) =5×1 =5 解:(112+115)×12×15 =112×12×15+115×15×12 =15+12 =27 解:(38+227)×8+1127 =38×8+227×8+1127 =3+(1627+1127) =3+1 =4 解:75×87.5%+24×78+0.875 =(75+24+1)×0.875 =(99+1)×0.875 =100×0.875 =87.5
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