3y+3x=9x=y=

（x+y-5)*（x+y-5)+（x-y+3)=0x*x-y*y（x+y-5)*（x+y-5)+（x-y+3)=0x*x-y*y（x+y-5)*（x+y-5)+（x-y+3)=0x*x-y*y这是什么

已知:3x-5y=0,求x/y,x-y/y,x-y/x已知:3x-5y=0,求x/y,x-y/y,x-y/x已知:3x-5y=0,求x/y,x-y/y,x-y/x3x-5y=03x=5y→x/y=5/

3(x+y)-2(x-y)=114(x+y)+3(x-y)=93(x+y)-2(x-y)=114(x+y)+3(x-y)=93(x+y)-2(x-y)=114(x+y)+3(x-y)=93(x+y)-

4(x-y)-3(x-y)=95(x-y)+2(x-y)=114(x-y)-3(x-y)=95(x-y)+2(x-y)=114(x-y)-3(x-y)=95(x-y)+2(x-y)=11打错了吧,这样

推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做.推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做.推倒公式:(x+y)(x*x-3x+y*y)=x

(x+y)(x-y)+(x-y)平方-(x-y)(3x-y)其中x=-2y=3分之一(x+y)(x-y)+(x-y)平方-(x-y)(3x-y)其中x=-2y=3分之一(x+y)(x-y)+(x-y)

(x-y)(x-2y)+(x+2y)(x-3y)-2(x-3y)(x-4y)=(x-y)(x-2y)+(x+2y)(x-3y)-2(x-3y)(x-4y)=(x-y)(x-2y)+(x+2y)(x-3

已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)已知x-y/x+y=3,求代数式5(x-y)/x+y

化简x-y/(y-x)^3=化简x-y/(y-x)^3=化简x-y/(y-x)^3=(x-y)/(y-x)^3=(x-y)/[-(x-y)^3]=-1/(x-y)^2原式=-1/(x-y)^2原式=（

(x+y)(2x-3y)=?(x+y)(2x-3y)=?(x+y)(2x-3y)=?（x+y）（2x-3y）=2x-3xy+2xy-3y=2x-xy-3y

求函数f（x,y）=x×x×x－y×y×y+3×x×x+3×y×y－9x的极值求函数f（x,y）=x×x×x－y×y×y+3×x×x+3×y×y－9x的极值求函数f（x,y）=x×x×x－y×y×y+

y(x+y)+(x-y)²-（x+y）（x-y）,其中x=-1/3,y=3y(x+y)+(x-y)²-（x+y）（x-y）,其中x=-1/3,y=3y(x+y)+(x-y)

已知3x=2y求x/x+y+y/x-y-y²/x²-y²已知3x=2y求x/x+y+y/x-y-y²/x²-y²已知3x=2y求x/x+y+

【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=【2(x-y)^3-8(

已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值已知x-y=3,求[（x+y)(x-

9y=3x-(x-1),4(x+y)-(2x+4)=8y9y=3x-(x-1),4(x+y)-(2x+4)=8y9y=3x-(x-1),4(x+y)-(2x+4)=8y解9y=3x-(x-1)2x-9

5x=3y,(2x+y)的平方=5x(x+y)+95x=3y,(2x+y)的平方=5x(x+y)+95x=3y,(2x+y)的平方=5x(x+y)+95x=3y,x=3y/5(2x+y)的平方=5x(

3x-2y=9x-3y=2x+y=5x+2y=3y=x2x+y=83x-2y=9x-3y=2x+y=5x+2y=3y=x2x+y=83x-2y=9x-3y=2x+y=5x+2y=3y=x2x+y=8解

3y=2xy/3=x/212/x=9/yy/x=?y/x=?x/y=?3y=2xy/3=x/212/x=9/yy/x=?y/x=?x/y=?3y=2xy/3=x/212/x=9/yy/x=?y/x=?

根据3（x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可得出x+y=,x-y=根据3（x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可得出x+y=,x-y=根据3（x+y)