已知x+y=2/9,xy=-9/10 求5x²y+5xy²
已知x-xy=8,xy-y=-9,求x+y-2xy的值
已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值
已知x2+y2=9,xy=-3,求多项式5x²-3xy-5y²-11xy-8x²+2y
已知x+y=3 xy=-5 求x设abc=1 求x²+3xy+2y²/x²y+2xy
已知x-y=根号5,xy=二分之一,求x²-xy+y²
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
已知(x+3)+丨X-y+10丨=0 ,求5x²y-[2x²y-(3xy-xy²)-3x&
已知x²+y²=9,xy=-3,求多项式5x²-3xy-5y²-11xy-8x&
已知x-y=9,xy=5,求x²+y²的值
已知xy²=-6,求xy(x^3y^7-3x^2y^5-11.5y)的值
已知xy^2=-2,求-xy(x^2y^5-xy^3-y)的值.