题目
下面各题,怎样算简便就怎样算。
(1)
1.25×3.2×0.25
(2)
(16.2-0.54)÷1.8
(3)
2.5×1.36+26.4×0.25
(4)
1.17÷[(4.7+2.5)×1.25]
答案: 1.25×3.2×0.25 =(1.25×0.8)×(4×0.25) =1×1 =1
(16.2-0.54)÷1.8 =16.2÷1.8-0.54÷1.8 =9-0.3 =8.7
2.5×1.36+26.4×0.25 =2.5×(1.36+2.64) =2.5×4 =10
1.17÷[(4.7+2.5)×1.25] =1.17÷[7.2×1.25] =1.17÷9 =0.13