1.25×0.4= 1×3.12-0.8= 5.4×0.2-0.9= 1.25×0.4=

问题描述:

1.25×0.4= 1×3.12-0.8= 5.4×0.2-0.9= 1.25×0.4=

0.496 2.29 0.18 0.5