y=2x平方-3x 1因式分解-搜答案-智慧作业帮

双十字叉乘法直接出结果（2x+y+2）（x+y+1）再问：不懂，可以说的更具体点么再答：怎么说呢，十字叉乘法有学过吗再问：一点点再答：十字叉乘法是解只含有一个未知数如x的因式分解，双十字叉乘法可以用来

3*((x-y/3+根号22/3*y)*(x-y/3-根号22/3*y))

(x+y)的平方-2x-2y-3=(x+y)的平方-2(x+y)-3=(x+y-3)(x+y+1)

可以使用平方差公式：m^2-n^2=(m+n)(m-n)所以(2x＋y)^2-(x+2y)^2=（2x＋y+x+2y)(2x＋y-x-2y）=(3x+3y)(x-y)=3(x+y)(x-y)

Y^2(2X+1)(X-3)

（x+y）(x+2y)=x²+xy+2xy+2y²=x²+3xy+2y²

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

3(x-2y)-x²y(2y-x)=3(x-2y)+x²y(x-2y)=(x-2y)(3+x²y)

3a(x-y)-2(y-x)^2=3a(x-y)-2(x-y)^2=(x-y)[3a-2(x-y)]=(x-y)(3a-2x+2y)

3(x+y)的平方-27=3[(x+y)^2-9]=3(x+y+3)(x+y-3)

(3x-4y)(4x+3y)-2(2x-y)^2=12x^2-7xy-12y^2-2(4x^2-4xy+y^2)=4x^2+xy-14y^2(4x-7y)(x+2y)

(x-y)平方+2y(x-y)=(x-y)(x-y+2y)=(x-y)(x+y)

(4x-3y)²-16y²=(4x-3y+4y)(4x-3y-4y)=(4x+y)(4x-7y)x²+2x(y-z)+(z-y)²=x²+2x(y-z

(2x+y)*(x-3y)

x^2-y^2-x+3y-2=(x^2-x+1/4)-(y^2-3y+9/4)=(x-1/2)^2-(y-3/2)^2=(x-1/2-y+3/2)(x-1/2+y-3/2)=(x-y+1)(x+y-2

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

令-4x²+3xy+2y²=0即4x²－3xy－2y²=0解得x=﹙3±√41﹚y/8∴-4x²+3xy+2y²＝﹣4[x－﹙3＋√41﹚y

x²-y²+5x+3y+4=（x²+4x+4）-（y²-4y+4）+x-y+4=（x+2）²-（y-2）²+x-y+4=（x+y）（x-y+

-y平方x-4x平方y+2x的3次方=2x³-4x²y-xy²=x(2x²-4xy-y²)

x平方-4y平方-x-2y=(x+2y)(x-2y)-(x+2y)=(x+2y)(x-2y-1)