分解因式x的平方减2xy加y的平方减5x加5y减5-搜答案-拍题作业网

（x-y）（x-y-2）-3

答：-x³y+2x²y-xy=-xy(x²-2x+1)=-xy(x-1)²

xy^2-2xy+2y-4=xy(y-2)+2(y-2)=(xy+2)(y-2)

x³－2x²y＋xy²=x(x²－2xy＋y²)=x(x－y)²

3x³-6x²y+3xy²=3x(x²-2xy+y²)=3x(x-y)²

8(x^2-2y^2)-x(7x+y)+xy=8x^3-16y^2-7x^2-xy+xy=8x^3-16y^2-7x^2无法再分解

求根法：x^2+xy-2y^2+2x+7y-3=x^2+x(y+2)-2y^2+7y-3,△（x)=(y+2)^2-4(-2y^2+7y-3)=9y^2-24y+16=(3y-4)^2,x1=[-(y

(x+3)(x-1)

双十字相乘.

原式=2[x^2+1/2xy+(y/4)^2]-y^2-1/8*y^2=2(x+y/4)^2-9/8*y^2=[√2(x+y/4)+(√9/8)y]*[√2(x+y/4)-(√9/8)y]上式再化减一

由x³-2x²y+xy²-x=x（x²-2xy+y²-1)=x[（x-y）²-1]=x（x-y-1）（x-y+1）.再问：分解因式：-49x

1x²+2xy-3y²=x²+2xy+y²-4y²=（x+y）²-(2y)²=(x+y+2y)(x+y-2y)=(x+3y)(x-

解(1/2)x²+2xy+2y²=(x²+4xy+4y²)/2=(x+2y)²/2

=(x²+4xy+4y²)/2=(x+2y)²/2

2x³-8x²y+8xy²=2x(x²-4xy+4y²)=2x(x-2y)²

原式=(x+y)(x+2y)+2(x+2y)=(x+2y)(x+y+2)希望我的回答能帮助到您,

2x^2-4xy+2y^2=2(x^2-2xy+y^2)=2(x-y)^2

（x-y+z）(x-y-z)

(1)3x²-4xy+6y²Δ=4²-4×3×6=16-72

(xy-1)^2+(x+y-2xy)(x+y-2)=(xy-1)^2+4xy+(x+y)^2-2(xy+1)(x+y)=(xy+1)^2+(x+y)^2-2(xy+1)(x+y)=(x+1)^2(y+