计算：(u-v)^2-uv 1/4x^2-(1/2x-y)(1/2x+y) 因式分解：-10xy+25x^2+y^2 2

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计算：(u-v)^2-uv 1/4x^2-(1/2x-y)(1/2x+y) 因式分解：-10xy+25x^2+y^2 2)2x^2+5x-3 3)x^4-6x^
计算：(u-v)^2-uv 1/4x^2-(1/2x-y)(1/2x+y) 因式分解：-10xy+25x^2+y^2
2)2x^2+5x-3 3)x^4-6x^2+8 4)(x^2-y^2)-(x-y)^2 5)x^2n+2-4x^2x 6)(x^2+y^2)^2-4x^2y^2 7)(x+y)^2+2(x^2-y^2)+(x-y)^2 8)x^4-5x+4 9)x^3+2x^2-63x

(u-v)^2-uv
=u²-2uv+v²+uv
=u²-uv+v²
1/4x^2-(1/2x-y)(1/2x+y)
=1/4x²-1/4x²+y²
=y²
因式分-10xy+25x^2+y^2=(5x-y)²
2)2x^2+5x-3 =(2x-1)(x-3)
3)x^4-6x^ +8=(x²-2)(x²-4)=(x-2)(x+2)(x²-2)
4)(x^2-y^2)-(x-y)^2 =(x-y)(x+y)-(x-y)²=(x-y)(x+y-x+y)=2y(x-y)
5)x^2n+2-4x^2n=x^2n(x²-4)=x^2n(x-2)(x+2)
6)(x^2+y^2)^2-4x^2y^2=x^4+2x²y²+y^4-4x²y²=(x²-y²)²=(x-y)²(x+y)²
7)(x+y)^2+2(x^2-y^2)+(x-y)^2 =(x+y)²+2(x+y)(x-y)+(x-y)²=(x+y+x-y)²=(2x)²=4x²
8)x^4-5x^+4 =(x²-1)(x²-4)=(x-1)(x+1)(x-2)(x+2)
9)x^3+2x^2-63x=x(x²+2x-63)=x(x-7)(x+9)

u=x+y,v=x-y,用uv来表示x²-√2 ×xy+y² x^2+y^2-x-y-xy+1如何因式分解（xy-x-y+1)^2因式分解因式分解；x^2-2xy+y^2-1; x^2-4y^2+x-2y 是关于因式分解的``1.计算x×x×x×x+5×x×x-6(x+y)(x+y+2xy)+(xy+1)(xy-1)2.已知因式分解：x×x-xy-2y×y-x-y 多项式因式分解 1,(x-y)³-(x-y)²(x+y) 2,x(x²-xy)-(4x&# 因式分解 1.（v-2u)^2-(2u-v)(u+2v)-2v+4u 2.2x(-1+2y)-6y(2+y) 因式分解xy+y平方+x-y-2 把4（x-y+1)+y(y-2x)因式分解 1、因式分解：(x+1)(2x-1)-(2x-1)^2 2、计算：[x(x^2y^2-xy)-y(x^2+x^3y)]÷ 因式分解(x+y)^3+2xy(1-xx-y)-1