运用简便方法计算:(7/18+5/9)*27/35

问题描述:

运用简便方法计算:(7/18+5/9)*27/35

(7/18+5/9)*27/35
=7/18x27/35+5/9x27/35
=3/10+3/7
=21/70+30/70
=51/70 希望能帮你忙,懂了请采纳,