1/9÷5/6+1/6÷9＝1/9×6/5+1/6×1/9＝1/9×(1+1/5)+1/6×1/9＝1/9×(1+1/5+1/6)＝1/9×41/30＝41/270不过严重怀疑，你的原题是：1/9÷6/5+1/6÷9
