Question

(x-2)的平方-（y-3)的平方=（x=y)(x-y 等于多少

Answer 1

(x+2)^2-(y-3)^2=(x+y)*(x-y)

x^2+4x+4-y^2+6y-9=x^2-y^2

4x+6y-5=0即为所求的方程