2x+4y=10 X*y=3
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
(x+y)(x+2y)(x+3y)(x+4y)=-40
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
解方程组 10(x-y)=3(x+y)+15 6(x+y)=4(2x-y)+16
解方程组X+Y/2=3X-2Y=10+6X+Y/4
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y