解方程:(x+3)(y-2)=(x-3)(y+10) (x-1)(y+3)=(x+2)(y+12)
解方程组:(x+3)(y-2)=(x-3)(y+10),(x+1)(y+3)=(x-2)(y+12)
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
解方程x+y+(x+y/2)=15 3x+5y+4(x+y/2)=62
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)
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
2(x+y) 3x+3y=24 x+y/2x x y/2y= 1
解方程y²-3x²+x+1=0,2x-y=1
解方程 8x+5y=9,3x-5y=1 3x-2y=5,5x+4y=12
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
方程(3x+1)-(y+2)=x+y,若用含X的代数式表示Y,则Y=