(x-3)的平方-(y+2)的平方=(x+y)(x-y)① 2x+y=2②
x=3/2 y=-1请写出具体过程5 - 6 x + x^2 - 4 y - y^2 = x^2 - y^2① 2x+y=2②5 - 6 x - 4 y=0 2x+y=2x=3/2 y=-1