(x+y)²+4(x+y)-5
(x+y)²+4(x+y)-5
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
(2x-y)²-4(x-y)(x+2y)
化简:(2x-y)²-4(x-y)(x+y)
(3x-y)²-2x(4x-5y)-(x+2y)²
已知x²+y²+5=2x+4y,求代数式(2x²-(x+y)(x-y))x((x+y-1)
因式分解:x²-y²-3x-5y-4
因式分解x²-5x+10y-4y²
1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [(x+y)(x-y)-(x-y)^2+2y(x-y
计算4(x+y)^5(x-y)^4÷[2(x+y)³*(y-x)²]
已知x²+y²-2x+4y+5=0,求x+y
已知x²+4x+y²-2y+5=0,则x+y=