谁会解:(10y+x)/(x+y)=8.7 (10x+y)/(10y+x)=4.3
-{-[-(x-y)]}+{-[(x+Y)]}
x(x-y)-y(y-x)+(x-y)²因式分解
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
2.5(X+Y)=1200 10/3(X-Y)=1200
{(x-y)²+(x+y)(x-y)}÷2x
先化简,再求值:【(X+2Y)(X-2Y)-(X+4Y)平方]除4Y,其中X=-2,Y=-3
先化简,再求值:【(X+2Y)(X-2Y)-(X+4Y)平方]除4Y,其中X=5,Y=2
已知2x-y=10,求((x+y)-(x-y)+2y(x-y))÷4y的值
y=5;x=14;y=((x=3*y,x+6),x-1); printf(''x=%d,y=%d'
(2/3x-2/x+y(x+y/3x-x-y))÷x-y/x,其中5x+3y=0
x²+y²-4x+6y+13=0,求(3x+y)²-3(3x+y)(x+y)-(x-3y)
因式分解x²(x-2y)+y²(2y-x)