已知x-3√(xy)-4y=0
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
已知(x+2)^2+|x+y+5|=0,求3x^2y-[2x^2y-(2xy-x^2y)-4x^2]-xy
1.已知x>0,y>0,且x+3y=4√xy,求√xy+y分之x+√xy
已知2x²-3y²=xy,(xy≠0),求值(4xy-x²)/(xy+2y²)的
已知X—根号3XY-4Y=0,求(2X+3根号XY-2Y)/(3X-根号XY+Y)的值
已知(x+2)*+|y+1|=0求5xy*-{2x*y-【3xy*-(4xy*-2x*y)】}的值
已知x>0,y>0,x-5√xy -6y=0,求代数式(4x+√xy +3y)÷(9x+5√xy +6y)的值
已知(4x-3y)2=(3x-2y)2,并且xy≠0,求xy
已知x-y=4,xy=-2,求代数式(2x+3y-2xy)-(x+4+xy)-(3xy+2y-2x)的值
已知x+xy=-2,xy-y=-6求代数式2x{-4y-3[(x+xy)²+x]-½[(y-xy
已知:3x方+xy-2y方=0,求(x+y/x-y + 4xy/y方-x方)除以 x方+2xy-3y方 / x方-9y方
已知X²+3XY-4Y²=0(Y≠0)求X-Y/X+Y