(x-2y)²-(3x+4y)²
(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
(x+y)和(x-y)各看成一个整体,合并同类项2(x+y)-3(x-y)²+3(x+y)+4(x-y)
(x-2y)²+(2x-4y)(x+y)+(x+y)²
(x-2y)²-(3x+4y)²
因式分解:X²-Y²+2X-4Y-3
因式分解 (4x+3y)²-(2x+y)²
化简 3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²
因式分解:(x-y)(3x-7y)²-4(x-y)(x+y)²
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
[(3x+y)²-(3x-y)²]÷(4x-2y)计算 怎么做?