已知x+y=1,x^3+3x²+3x+3y-3y²+y^3=37,则(x+1)^4+(y-1)^4=
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
已知x²+|y+x|=x-1/4,求(3x+y)²(2x-y)²-(4x²+y&
{3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1
{4/(x+y)+6/(x-y)=3 {9/(x-y)-1/(x+y)=1
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的
已知x+y+2(-x-y+1)=3(1-y-x)-4(y+x-1),则x+y等于( )
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
已知3x-4y/2x+y=1/2 求x/y的值
已知X和Y满足3X+4Y=2,X-Y-1/7
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²