3/5xy(5x²-2y²-5/3xy),求结果的,
已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值
已知xy^2=-2,求-xy(x^2y^5-xy^3-y)的值.
1/x+1/y=5,求2x-3xy+2y/x²+xy+y的值
已知xy²=-6,求xy(x^3y^7-3x^2y^5-11.5y)的值
已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值
已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值
已知x-y=2xy,求代数式3x-5xy-3y/x+xy-y的值
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
已知x^-xy=5,xy-y^=-3,求式子3(x^-xy)-xy+y^的值
已知x+y=3 xy=-5 求x设abc=1 求x²+3xy+2y²/x²y+2xy
若x²+xy+5y=3,y²+xy+5x=-3,求x+y的值.