Question

6y+12/y^2+4y+4-y^2-4/y^2-4y+4+y^2/y^2-4=0

Answer 1

6(y+2)/(y+2)²-(y+2)(y-2)/(y-2)²+y²/(y+2)(y-2)=0

6/(y+2)-(y+2)/(y-2)+y²/(y+2)(y-2)=0

两边乘(y+2)(y-2)

6y-12-y²-4y-4+y²=0

2y-16=0

y=8

经检验,y=8是方程的解