因式分解 1,x^4-7x^2-24x-15 2,-2x^+5xy+2y^2 3,x^3+2xy-x-xy^2 4,x^-2x-4 5,4x^+8x-1

问题描述:

因式分解 1,x^4-7x^2-24x-15 2,-2x^+5xy+2y^2 3,x^3+2xy-x-xy^2 4,x^-2x-4 5,4x^+8x-1
6 ,-x方-y方+2xy+1

1:x^4-7x^2-24x-15=(x^2-3x-3)(x^2+3x+5)2:-2x^2+5xy+2y^2 =2(y+x)(y-x)+5xy3:x³+2xy-x-xy²=x(x²+2y-1-y²)=x[x²-(y²-2y+1)]=x[x²-(y-1)²]=x[x-(y-1)][x+(...