2.5✖️0.6➖1.8✖️0.5简便运算怎么做？

Answer 1

2.5×0.6-1.8×0.5
=0.5×5×0.6-1.8×0.5
=0.5×3-1.8×0.5
=0.5×（3-1.8）
=0.5×1.2
=0.6