已知5x=2,5y=3,则53x+2y-1 =
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
已知x/1-y/1=3,则5x+xy-5y/x+2y-y的值为
1、已知x=2y,则x-5y/x+y=()
已知x-y=-3y+5,则式子x+2y-1的值是?
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy)
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,y满足-5|x-2y|+8|y-1\2|=0则x=( ),y=( )
已知1/x+1/y=5,求2x-3y+2y/-x+2xy-y
已知1/x+1/y=5,求(2x-3y+2y)/(x+2xy+y)的值