[(xy-1-x+y)÷(y-1)+(y-1)]×2求化简

问题描述:

[(xy-1-x+y)÷(y-1)+(y-1)]×2求化简

原式={[(x(y-1)+(y-1)]÷(y-1)+(y+1)}×2
=[x+1+y+1)×2
=2x+2y+4