解放程组2X-3Y=X+2=3X+Y
解放程组2X-3Y=X+2=3X+Y
3x+4y=15 2x-4y=10 解放程组,
解放程x+y-z=4,2x-y+x=5,x-3y+x=-2 3x-2y=8,2y+3z=1,x+5z=7
解放程组2x-y=7,5x+3y+2z=2,3x-4z=4
解放程:(2X+3Y-Z-2)的绝对值+(3X+2Y-Z-2)的平方+根号(4X-5Y+6Z+17)=0
1/x-3-1=2/3-x解放程
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20