7.8×0.18 0.78×6.2 0.078×20的简便方法?

2024-12-17 10:26:53
推荐回答(1个)
回答1:

=7.8×0.18+7.8×0.62+7.8×0.2
=7.8×(0.18+0.62+0.2)
=7.8×1
=7.8