若5x-7xy-6y^2=0,求3x\y的值(要过程)
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
若(3xy+2)+|7-x-y|=0,求代数式(5xy+10y)-[-5x-(4xy-2y+3x)]的值.
已知xy^2=-6,求-xy(x^3y^7-3x^2y^5-y)的值
若x=1/2,y=1,求x(x的平方+xy+y的平方)-y(x的平方+xy+y的平方)+3xy(y-x)的值(要有过程)
若x=y=6,xy=2,求2x+3y-3xy+(4xy-3x)-(4y-7)的值
若x-y=5,-xy=3,求(7x+4y+xy)-6(5/6y+x-xy)的值
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
若1/x-1/y=2,求3x-2xy-3y/x-2xy-y的值【要过程】
x-y=3,xy=5,求代数式(7xy+4x-7y)+(6x-3xy)-(3y+4xy)的值
x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值
若x>0,y>0,且√x(√x+√y)=3√y(√x+5√y),求(2x+2√xy+3y)/(x-√xy+y)的值.
化简求值,若X方-2XY+Y方+1XY-11=0,求X方+6XY+9Y方分之X方-25Y方*5X-25Y分之X+3Y的值