3.5x5/4+5.5x80%+0.8怎样用简便方法做

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3.5x5/4+5.5x80%+0.8怎样用简便方法做3.5x5/4+5.5x80%+0.8怎样用简便方法做3.5x5/4+5.5x80%+0.8怎样用简便方法做=3.5x0.8+5.5x0.8+0.

3.5x5/4+5.5x80%+0.8怎样用简便方法做
3.5x5/4+5.5x80%+0.8怎样用简便方法做

3.5x5/4+5.5x80%+0.8怎样用简便方法做
=3.5x0.8+5.5x0.8+0.8=(3.5+5.5+1)x0.8=10x0.8=8