xy=6 x+y=5 求x与y值

xy=6 x+y=5 求x与y值 已知x+y=5,x-y=1求xy与x^2+y^2-xy的值 x+y=6,xy=8,求5x+xy+5y/x-xy+y的值 若x+y=5,xy=6,求x^2y+xy^2的值 已知x+y=5,xy=6,求x²y+xy²的值 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 已知x+y=6,xy=7,试求x*x+y*y,x*x-y*y的值 已知x+y=-5,x*x+y*y=19求xy和（x-y)*(x-y)的值 1/x-1/y=x,求5y+xy-5y/y-xy-x=? 已知xy/x+y=3,求代数式3x-5xy+3y/-x+3xy-y的值.已知xy/x+y=3,求代数式3x-5xy+3y/-x+3xy-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 已知(x+y)(x+y)=25,(x-y)(x-y)=9求xy与xx+yy的值 诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy) 已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值 已知xy=2(x+y),求5x-xy+5y/3xy-x-y的值 已知x-y=3xy,求5x+2xy-5y/x-4xy-y的值 已知xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值.