采纳吧
(1/2+1/3)÷(1/2-1/3)=5/6÷1/6=53/10+1/7=21/70+10/70=31/70米4/29*(3/5-3/10)=4/29*3/10=6/145
1/2+1/3=5/6 1/2-1/3=1/6 商=5/6÷1/6=53/10+1/7=31/70 4/29×(3/5-3/10)=6/145