x+y×3x-y

(3x-y)(3y+x)-(x-y)(x+y)(3x-y)(3y+x)-(x-y)(x+y)=9xy+3x²-3y²-xy-(x²-y²)=3x²+8xy-3y²-x²+

3y/x*x-y*y+x/x*x-2xy+y*y+6y*y/x*x*x-x*x*y-xy*y+y*y*y等于多少?3y/(x^2-y^2)+x/(x^2-2xy+y^2)+6y^2/(x^3-x^2y-xy^2+y^3)=3y/[(x+y)

x(x-y)2-(y-x)3（x-y）(2x+3)

多项式因式分解,(1)y(x-y)+x(x-y)(2)y(x-y)+x(y-x)(3)a(x-y)^2-b(y-x)^2(4)a(x-y)^3-b(y-x)^3(5)a^2b(a-b)-ab^2(a-b)(1)y(x-y)+x(x-y)原式

（y-x)+x(x-y)^3-(y-x)^4因式分解题目抄错吗

已知XY.Y=-3,求-XY(X.X.X.Y.Y.Y.Y.Y.Y.Y-3.X.X.Y.Y.Y.Y.Y-Y)的值.（过程完整）=-(xy^2)^4+3(xy^2)^3+(xy^2)^2=-27-27-3=-57xy^2=-3-XY(X.X.X

[2/3x-2/x+y(x+y/3x-x-y)]/x-y/x看不懂,分式不好看,不知道分子分母是多少,你重新写一下,必要时加上小括号（）.

化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x(3x-2)/(x+y)*[(x+y)/3x-x-y]÷(x-y)/x=(3x-2)/(x+y)*(x+y)(1/3x-1)÷(x-y)/x=(3x-2)*(1-3x)/3

化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x＝[2/3x-(2/3x-2)*x/(x+y)=2x/(x+y)

计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x原式=[2/3x-2(x+y)(1/3x-1)/(x+y)]*x/(x-y)=[2/3x-(2/3x-2)]*x/(x-y)=2x/(x-y)

{(x,y)|x|+|y|区域是一个正方形

x>y?x:y判断X的数值是否大于Y的数值如果是则为真等式去X的值反之取Y的值

计算3x+4y/x-y+3y/y-x-4x/x-y3x+4y/x-y+3y/y-x-4x/x-y=(3x+4y)/(x-y)-3y/(x-y)-4x/(x-y)=(3x+4y-3y-4x)/(x-y)=(y-x)/(x-y)=-1=(3x+

3x+4y/x-y+3y/y-x-4x/x-y=(3x+4y)/(x-y)-3y/(x-y)-4x/(x-y)=[(3x+4y)-3y-4x]/(x-y)=(y-x)/(x-y)=-1(3x+4y)/(x-y)+3y/(y-x)-4x/(x

[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)=(x-y)[(3x+y)-(2x+3y)]*(x-y)=(x-y)*(x-y)(3x+y-2x-3y)=(x-y)(x-y)(x-2y)到底是化简,还是?=(x*x-2xy+

x(4y-x)(x-3y)+y(3y-x)(x-4y)因式分解（x＋y）（4y－x）（x－3y）

计算：x+2y/x-y+2x/y-x-3y/x-y原式=(x+2y)/(x-y)-2x/(x-y)-3y/(x-y)=(x+2y-2x-3y)/(x-y)=(-x-y)/(x-y)答案是（-2xy^2-y^2+2x^2）/(xy)

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

（x+y-5)*（x+y-5)+（x-y+3)=0x*x-y*y这是什么题目?用比较直接的方法吧由题意知x+y=5x-y=-3解得x=1y=4然后就可以直接得到答案了当然这个只是特殊的方法具体的可能会有几个也可能只有这个而已

已知:3x-5y=0,求x/y,x-y/y,x-y/x3x-5y=03x=5y→x/y=5/3y/x=3/5（x-y）/y=x/y-1=2/3(x-y)/x=1-x/y=2/5