若xy/(x+y)=3,则(6x+4xy+6y)/(9x+4xy+9y)=______
若xy/(x+y)=3,则(6x+4xy+6y)/(9x+4xy+9y)=______
x*-2xy+3y*=9 4x*-5xy+6y*=30
已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y)
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
{xy\x+y=6 xy\9x+4y=1
x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值
已知x-y=4xy,则2x+3xy-2yx-2xy-y
已知x+xy=-2,xy-y=-6求代数式2x{-4y-3[(x+xy)²+x]-½[(y-xy
(-3x^y+2xy)-( )=4x^+xy
[3xy(1-x)-6xy(x-1/2)]*2x*(-xy)平方,x=-1 y=2 ; 3xy平方(-1/3x平方y+4
已知X+Y=6,xy=3求代数式(5XY+4X+7Y)+(6X-3XY)-(4XY-3Y)的值
已知x+y=3,xy=1,求代数式5xy+4x+7y+6x-3xy-4xy+3y的值.