计算:(x+y)2-(x-y)2=___.
计算:(x2-2x+1-y2)÷(x+y-1)= ___ .
因式分 16-8(x-y)+(x-y)2= ___ .
计算:(x-y)m(y-x)2m+(y-x)3m.
计算:1/(2x) - 1/(x+y)((x+y)/(2x) - x - y)
计算:(x-4y)(2x+3y)-(x+2y)(x-y).
计算:(2x-3y)2-(2x+3y)(2x-3y)=______.
(x+y)^2-(3x-2y)^2计算
计算 (x-1+y-1)÷(x-1-y-1)= ___ .
初二下册计算:(x-y /x+2y)³
计算:(3x-y)2-(2x+y)2+5x(y-x)
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
已知实数x,y满足xy+1=2x+y,且x>1,则(x+1)(y+2)的最小值为 ___ .