题目
脱式计算,能简算的要简算.
(1)
0.47×25×4
(2)
3.09÷3.09÷2.5
(3)
12.5×3.2×2.5
(4)
0.46×1.9+0.54×1.9
答案: 解:0.47×25×4 =0.47×(25×4) =0.47×100 =47
解:3.09÷3.09÷2.5 =1÷2.5 =0.4
解:12.5×3.2×2.5 =12.5×(8×0.4)×2.5 =(12.5×8)×(0.4×2.5) =100×1 =100
解:0.46×1.9+0.54×1.9 =1.9×(0.46+0.54) =1.9×1 =1.9