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