x+y=6,xy=8,5x^2+5y^2=?

诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy) 2x^+xy-y^-4x+5y-6=? 已知xy/x+y=2,求代数式8x-5xy+8y/-x+3xy-y的值 x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值 已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值 x+y+xy=5 (x^2)y+x(y^2)=6 解方程组 6（x-y)-7(xy)=21,2(x-y)-5(x+y)=-1 图解(x+2y)(x+3y）=x平方+5xy+6y平方 4xy-[(x²+5xy-y²)-(3xy-1/2y)]x=3,y=-6 3x²-2xy-y²+2x+6y=8,2x²-3xy-5y²+3x+17y=14 √x(√x+2√y)=√y(6√x+5√y,求x-3√xy+2y/x+√xy-6y ∫x(∫x+2∫y)=∫y(6∫x+5∫y),求：（x+∫xy-y)/(2x+∫xy+3y) 已知x>0,y>0,且x+6y=5根号xy,求(2x+根号xy-y)分之(x+根号xy+2y)的值 已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+x(xy+y)的值 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 若x-y=5,xy=6,求x^2-xy^2和x^2y+xy^2 若x+y=5,xy=6,求x^2y+xy^2的值 xy=6,x-y=5,x^2y+xy^2