若x^2+xy+y=5,y^2+xy+x=7,则x+y的值为球解答TVT

若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 若xy/x+y=2,则3x-5xy+3y/-x+3xy-y=?/是分之 若xy=2（x+y),求 （3x-5xy+3y)÷(-x+3xy-y) 的值 若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)= 若x-y=5,xy=6,求x^2-xy^2和x^2y+xy^2 若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思，是3x-2xy-3y/x-2xy-y 若 x+y=5,xy=-50 则x^2y+xy^2 =( ) 若x+y=5,xy=6,求x^2y+xy^2的值 若x-y=1,xy=5,则x^2y-xy^2＝ 若x^2+xy+y=14,y^2+xy+x=28,求x+y 2xy+5y^2+( )=x^2+3xy 已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2 已知xy^2=-2,求-xy（x^2y^5-xy^3-y)的值. 已知xy^2=-2 求-xy(x^2y^5-xy^3-y) 已知xy^2=-2xy(x^2y^5-xy^3-y) 若(y-x)/xy=3,求分式(2x+3xy-2y)/(x-2xy-y)的值 若y-x/xy=3,求分式2x+3xy-2y/x-2xy-y xy^2=-3,求-xy(x^2y^5-xy^3-y)