计算(x-y)2-(x+y)(x-y)=______.
计算:(2x-3y)2-(2x+3y)(2x-3y)=______.
计算:(-4x-3y)2=______.
若|x-y+2|与(x+y-1)2互为相反数,则x=______,y=______.
计算:1/(2x) - 1/(x+y)((x+y)/(2x) - x - y)
计算:(x-y)m(y-x)2m+(y-x)3m.
计算:(x-4y)(2x+3y)-(x+2y)(x-y).
用行列式性质计算(需过程):(x,y,x+y; y,x+y,x; x+y,x,y )
因式分解:16(x-y)2-24xy(y-x)=8(x-y)(______).
已知(x+y+2)2+|2x-3y-1|=0,则x+y=______.
已知y=x-1,则(x-y)2+(y-x)+1的值为______.
已知2x+3y=5,则6x-4y-2(x-5y)=______.
若|3x-y-7|+(5x+2y-8)2=0,则x-y=______.