Question

12.25-1.25X3.2十0.8脱式计算,能简算的要简算,怎么算？

Answer 1

通过观察，能简算的是：
1.25*3.2
=1.25*8*0.4
=10*0.4
=4
所以，原式：
12.25-4+0.8
=8.25+0.75+0.05
=9+0.05
=9.05
请采纳谢谢

Answer 2

12.25-1.25×3.2+0.8
=12.25-1.25×（0.8×4）+0.8
=12.25-（1.25×0.8）×4+0.8
=12.25-1×4+0.8
=12.25-4+0.8
=8.25+0.8
=9.05