二点五乘二点八加十二点五乘七点二简便运算

2024-12-15 03:03:42
推荐回答(2个)
回答1:

2.5×2.8+12.5×7.2
=2.5×(4×0.7)+12.5×(8×0.9)
=(2.5×4)×0.7+(12.5×8)×0.9
=10×0.7+100×0.9
=7+90
=97

回答2:


97