√3(x+5)-3y=√24 7x+3(y+1)=14
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
已知:x*x+√3y=√5,y*y+√3x=√5,且x≠y,求 y/x+x/y
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
2(x+y) 3x+3y=24 x+y/2x x y/2y= 1
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
x+y=3 x+2y=9 3/x+1=y y-x=3 y=2x-3 y-3x=1 2(x+1)-y=6 7x-5y=-9
已知实数x,y,满足x-√x-1=√y+3-y,则x+y最大值是?
7x-3y/5=5x-y/3-x+y/2 x-1/5=y+1/3
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
{ x-y/7-x+y/10=1/2 {2(x-y)+5(x+y)=3
已知:x-y=1,x+y=-7,求代数式3(x+y)+20(x-y)-5的值
|2x+y+1|+√2y+3x=0则x.y=