若(3x-2y)²=5,(3x+2y)²=9,求xy的值.
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
1/x+1/y=5,求2x-3xy+2y/x²+xy+y的值
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
若(3xy+2)+|7-x-y|=0,求代数式(5xy+10y)-[-5x-(4xy-2y+3x)]的值.
求3x²y-2xy²+2(xy-二分之三x²y)-xy+3xy²的值,其中x=3
已知x-5y=0,求分式x²-2xy+y²/3x+y × (y-x)的值
已知x-3y=0,y≠0,求x²-2xy+y²分之2x+y×(x-y)的值
已知xy=2,x-y=3,求(x+y)(x-y)-y^2-(6x^2y-2xy^2)/2y的值.
已知xy=-2,x-y=3,求(x+y)(x-y)-y平方+(x-y)平方-(6x2y-2xy平方)/2y的值
已知xy²=-6,求xy(x^3y^7-3x^2y^5-11.5y)的值
已知xy^2=-6,求-xy(x^3y^7-3x^2y^5-y)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.