化简(3 2x^2y)^2(2x^2-4xy 7y^2)

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

{2/3x-2/(x+y)[(x+y)/3x-x-y]}/【(x-y)/x】的负二次方={2/3x-[2/(x+y)]*[(x+y)-3x(x+y)]/(3x)}*[x/(x-y)]^2={2/3x-

3x（2x+y)-2x(x-y)=6x^2+3xy-2x^2+2xy=4x^2+5xy=x(4x+5y)再答：采纳一下啊谢谢

∵x-2y+z=（x-y）-（y-z）,x+y-2z=（y-z）-（z-x）,y+z-2x=（z-x）-（x-y）．设x-y=a,y-z=b,z-x=c,则原式=-ac/(a-b)(b-c)+(-ba

原始=(4x²-4xy+y²+4x²-y²-4x²+4xy-4x)÷2x=(4x²-4x)÷2x=4x²÷2x-4x÷2x=2x-

[(x+2y)^2-(x-2y)^2-(x-2y)(x+2y)-4y^2]/2x=[x^2+4xy+4y^2-(x^2-4xy+4y^2)-(x^2-4y^2)-4y^2]/2x=(x^2+4xy+4

解原式=(3x²+xy-9xy-3y²)-(4x²-12xy)+9y²)=(3x²-8xy-3y²)-(4x²-12xy+9y&#

1)x(x-y)(x+y)-x(x+y)^2=x((x-y)(x+y)-(x+y)^2)=x(x^2-y^2-x^2-2xy-y^2)=x(-2xy-2y^2)=-2xy(x+y)2)（2a+b)(2

【(x-y)^2+(x+y)(x-y)】除以2x=(x-y)*(x-y+x+y)/2x=(x-y)*2x/2x=x-y

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

原式=(6x²+5xy-6y²)-(x²-4y²)=6x²+5xy-6y²-x²+4y²=5x²+5xy-2y

{(x+2y)(2y-x)-4y(-x+y)}/(-2x)(4y²-x²+4xy-4y²)/(-2x)=x/2+4y

（1)x^2/x)-y-x-y=x-y-x-y=-2y(2)(a/a-b)-(a/a+b)-(2b^2/a^2-b^2)=a(a+b-a+b)/(a^2-b^2)-(2b^2/a^2-b^2)=2b/

解代数式得：-3x的平方y-2y的三次方因为1/2的平方=-1/2的平方,所以结果仍正确给分吧!嘿嘿!

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

[(x-y)/(x+3y)]/[(x^2-y^2)/(x^2+6xy+9y^2)]-xy/(x+y)=(x-y)/(x+3y)*(x+3y)^2/(x-y)(x+y)-xy/(x+y)=(x+3y)/

第二个分母写错了?(y-x)(z-x)/(x-2y+z)/(x+y-2z)+(z-y)(x-y)/(x+y-2z)/(y+z-2x)+(x-z)(y-z)/(y+z-2x)/(x-2y+z)=1

[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x=[x^2+4xy+4y^2-3x^2-2xy+y^2-5y^2]/2x=(-2x^2+2xy)/2x=y-x

（x-2y)²-（2x-y)(-2x-y)+(x-5y)(x+2y)=x²+4y²-4xy-y²+4x²+2xy-5xy-10y²=6x&s

:【(2x-y)(2x+y)+y(y+6x)】÷2x=（4x^2-y^2+y^2+6xy)÷2x=2x+3yx^2代表的是x的平方的意思