(2x-5)^2-(2x+y)(2x-y) 其中x=3/1 y=-2/1

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(2x-5)^2-(2x+y)(2x-y)其中x=3/1y=-2/1(2x-5)^2-(2x+y)(2x-y)其中x=3/1y=-2/1(2x-5)^2-(2x+y)(2x-y)其中x=3/1y=-2

(2x-5)^2-(2x+y)(2x-y) 其中x=3/1 y=-2/1
(2x-5)^2-(2x+y)(2x-y) 其中x=3/1 y=-2/1

1.(2x-y)(2x+y)=4x^2-y^2
原式=(4x^2-y^2)^2
2.(1+x)(1-x)=1-x^2
(1-x^2)(1+x^2)=1-x^4
帮到你就给个好评吧

先化解在带入求值

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简y(x+y)+(x+y)(x-y)-x^2 因式分解x(x+y)(x-y)-x(x+y)^2 (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) 5x(x-y)+2y(x-y) 化简:5(x-y)+2(x+y)-3(x-y) 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) x^2(x-y)+(y-x) x(x-y)2-(y-x)3 （X+2Y)(5X-2Y) (x+2y)(5x-2y) 4x+2y-5x-y (2x-3y)-(5x-y) (2X-3y)-(5x-y) (x-y)^2+5(x-y)-14 (2x-5y)(3x+y) 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y)