解方程 1.y=3x+2 y+3x=8 2.2x=3y 4x-3y=4 3.3x+2y=3 2y=3x-1
解方程 1.y=3x+2 y+3x=8 2.2x=3y 4x-3y=4 3.3x+2y=3 2y=3x-1
{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X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
解方程x+y+(x+y/2)=15 3x+5y+4(x+y/2)=62