解方程组 x-3y=3 (x+2)²-(y-3)²=(x+y)(x-y)-2

解方程组 x-3y=3 (x+2)²-(y-3)²=(x+y)(x-y)-2
解方程组 x-3y=3 (x+2)²-(y-3)²=(x+y)(x-y)-2

解方程组 x-3y=3 (x+2)²-(y-3)²=(x+y)(x-y)-2
由(2)得
x²+4x+4-y²+6y-9=x²-y²-2
4x+6y=3 (3)
(1)×2+(3)得
6x=9
∴x=3/2
把x=3/2代入(1)得
3/2-3y=3
∴y=-1/2
∴x=3/2
y=-1/2