忘了.求帮助16x^3y^3+24x^2y^4-32x^2y^5
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知|2-x|与|x-y+4|互为相反数,求代数式3(x-y)-5(x-y)-3(x-y)+(y-x)-4(x+y)+3
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
3x=2y+4,3y=3x-4求大神帮助
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
若2x-3y=0,求5x+4y/3x-2y
求5x-2y=x-y=4x-3y-2的解
方程式计算5X-2=Y 4X+3=Y 求X.Y
已知x,y>0 2x+y+3=xy 求5x+4y最小值
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)