Question

2X的平方-6x/X的平方-9-x+3/3-X-2X+6/x的平方+6x+9=3

Answer 1

2x(x-3)/(x+3)(x-3)+(x+3)/(x-3)-2(x+3)/(x+3)²=3

2x(x-3)/(x+3)(x-3)+(x+3)/(x-3)-2/(x+3)=3

两边乘以(x+3)(x-3)得

2x(x-3)+(x+3)²-2(x-3)=3(x+3)(x-3)

2x²-6x+x²+6x+9-2x+6=3x²-27

-2x=-42

x=21

检验：x=21是方程的解