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