(x/y-y/x)÷x-y/x=(x²-y²)/xy÷(x-y)/x=(x+y)(x-y)/xy÷(x-y)/x==(x+y)/y=1+x/y选2..x+y/y
你好 (x/y-y/x)÷(x-y)/x=(x²/xy-y²/xy)×x/(x-y)=(x²-y²)/xy×x/(x-y)=(x+y)(x-y)/xy×x/(x-y)=(x+y)/y=x/y+1 【数学辅导团】为您解答,不理解请追问,理解请及时选为满意回答!(*^__^*)谢谢!