计算:(2x-3y)2-(2x+3y)(2x-3y)=______.
计算:(2x-3y)2-(2x+3y)(2x-3y)=______.
计算:(-4x-3y)2=______.
计算:(x-y)m(y-x)2m+(y-x)3m.
计算:(3x-y)2-(2x+y)2+5x(y-x)
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
计算:(x-4y)(2x+3y)-(x+2y)(x-y).
(x+y)^2-(3x-2y)^2计算
计算:(-x-2y) * (3x-y)
计算(x+y)(x+y)^2(-x-y)^3
已知(x+y+2)2+|2x-3y-1|=0,则x+y=______.
已知2x+3y=5,则6x-4y-2(x-5y)=______.
若|3x-y-7|+(5x+2y-8)2=0,则x-y=______.