3x-6y-5=0,求 2x-4x+6的值

已知4x²+y²-4x-6y+10=0求（2/3x（√9x）+(y²√x/y³)×(x²√1/x×5x√y/x)的值 已知4x²+y²-4x-6y+10=0求（2/3x（√9x）+(y²√x/y³)-(x²√1/x-5x√y/x)的值 已知4x²+y²-4x-6y+10=0,求[(2/3)x√(9x)+y²√(x/y³)-(x²√(1/x)-5x√(y/x)的值 已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值. 已知4x²+y²-4x-6y+10=0,求(2/3√9x+y²√x/y³)-(x√1/x-5x√y/x)的值. 已知4x²+y²-4x-6y+10=0,求(2/3√9x +y²√x/y³)-(x²√1/x -5x√y/x)的值. 已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值 x^2+y^2-4x-6y+13=0,求(2/3根号9x+y^2根号x/y^3)-x^2根号1/x-5x根号y/x)的值已知x^2+y^2-4x-6y+13=0,求(2/3根号9x+y^2根号x/y^3)-x^2根号1/x-5x根号y/x)的值 化简求值：已知x、y满足：x^2+y^2-4x+6y+13=0 求代数式 的值.(3x+y)^2-3(3x-y)(x+y)-(x-3y)(x+3y)急用！ 求一个二元函数的极限lim((x^2)y+x^5)/(x^4+x^6+2(x^3)y+y^2))(x,y)->(0,0)谢谢 若丨2x-5丨+(2x-5y+20)^2=0,求代数式(-2x^2)-2x(5y-2x)=3y(6x-5y)-3y(4x-5y)的值 3x-6y-5=0,求 2x-4x+6的值 x^2+4y^2-6x+4y+10=0,求x^4-y^4/(x+2y)(x-2y)*x+2y/xy^2+y^3除以（x^2+y^2/y)^2的值 如果1+x+x^2+x^3=0,求x+x^2+X^3+x^4+x^5+x^6+x^7+x^8的值, 已知4x+3y+5=0求3(8y-x)-5(x+6y-2)的值 /x+5y-6/+（3x+7y-4）2=0求x和y的值 若｜y+5｜+(5x+1)2=0,求-3(2x-y)-｛7x-[6x+2y-(10x-8y)]-x-2(3x-4y)｝的值 若|y+5|+(5x+1)^2=0,求代数式-3(2x-y)-{7x-[6x+2y-(10x-8y)]-x-2(3x-4y)}的值