A.(x+y)(x-y) B.(x-y)(-x-y) C.(-x+y)(x+y) D.(x+y)(-x-y)可以用完全平方公式计算的是?

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A.(x+y)(x-y) B.(x-y)(-x-y) C.(-x+y)(x+y) D.(x+y)(-x-y)可以用完全平方公式计算的是?
A.(x+y)(x-y) B.(x-y)(-x-y) C.(-x+y)(x+y) D.(x+y)(-x-y)可以用完全平方公式计算的是?

A.(x+y)(x-y) B.(x-y)(-x-y) C.(-x+y)(x+y) D.(x+y)(-x-y)可以用完全平方公式计算的是?
ABC都是平方差公式
A.(x+y)(x-y)=x^2-y^2
B.(x-y)(-x-y)=(x-y)[-(x+y)]=-(x-y)(x+y)=-(x^2-y^2)=-x^2+y^2
C.(-x+y)(x+y)=[-(x-y)](x+y)=-(x-y)(x+y)=-(x^2-y^2)=-x^2+y^2
只有D是完全平方公式
D .(x+y)(-x-y)=(x+y)[-(x+y)]=-(x+y)^2=-(x^+2xy+y^2)=-x^2-2xy-y^2
我写这么多的目的是告诉你,这题的考点除了完全平方公式,还有平方差公式和去/添括号的知识
特别是添括号

(x+y)(-x-y)
=(x+y)[-(x+y)]
=-(x+y)²
选D

(x+y)-(a-b)(x+y)因式分解因式分解 a(y-x)-b(x-y) (5)a(x+y)-b(x+y)-x-y因式分解通分:-x/a(x-y) ,y/b(y-x) 通分x/a(x-y),y/b(y-x) 通分 a/(y-x)^2,b/(x-y)(x+y) 因式分解a(x-y)+b(y-x)+(2x-y) a(x-y)(x+y)-b(y-x)(x+y)-c(x-y)^2(y+x)提取公因式 A.(x+y)(x-y) B.(x-y)(-x-y) C.(-x+y)(x+y) D.(x+y)(-x-y)可以用完全平方公式计算的是? (2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y) (-x+y)(y²+x²)再乘以( )就等于x`4-y`4 A.X-Y B.X+Y C.-X+Y D.-X-YA.X-Y B.X+Y C.-X+Y D.-X-Y`表示次方因式分解：a(x-y)^2+b(y-x)^3 4(x-y)^2+8(y-x)(x+y)1.a(x-y)^2+b(y-x)^3 2.4(x-y)^2+8(y-x)(x+y) (a-b)(x-y)-(b-a)(x+y)怎么算 (a+b)(x+y)-(a+b)(x-y)分解因式 (a-b)(x-y)-(b-a)(x+y)因式分解 (a+b)(x+y)-(b+a)(y-x)因式分解快 [a-b][x-y]-[b-a][x+y]的解法化简(x-y)(a+b)-(x-y)(a-b)