你好(3/6+2/6)÷2/5–2/3=5/6×5/2=17/12 望采纳，谢谢
(1/2+1/3)÷2/5-2/3 =5/6X5/2-2/3=25/12-2/3=17/12无简单计算方法
(1/2+1/3)÷2/5-2/3 =5/6*5/2-2/3=25/12-2/3=17/12
=(1/2+1/3)x5/2-2/3=5/4+5/6-4/6=5/4+1/6=17/12
无简单方法
