若x-y=5,xy=6,则x+y=

来源：学生作业帮助网编辑：六六作业网时间：2024/10/04 21:55:17

若x-y=5,xy=6,则x+y=若x-y=5,xy=6,则x+y=若x-y=5,xy=6,则x+y=(x-y)²+4xy=(x+y)²=5²+4×6=49x+y=±7x

若x-y=5,xy=6,则x+y=
若x-y=5,xy=6,则x+y=

若x-y=5,xy=6,则x+y=
(x-y)²+4xy=(x+y)²=5²+4×6=49 x+y=±7

x+y)^2=(x- y)^2+4xy
=25+24
=49

x+y=7或－7

若x-y=5,xy=6 ，
那么：（x+y)^2=(x- y)^2+4xy
=25+24
=49
则： x+y=土7 。

x=5+y, xy=(5+y)y=5y+y^2=6, (y-1)(y+6)=0, y1=1,y2=-6

|x|/x+y/|y|+xy/|xy|= 若xy/x+y=2,则3x-5xy+3y/-x+3xy-y=?/是分之若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)= 已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y) 若x>0,y>0,且x-根号xy=6y,则x/y= 2x^+xy-y^-4x+5y-6=? 若 x+y=5,xy=-50 则x^2y+xy^2 =( ) 若x-y=1,xy=5,则x^2y-xy^2＝若x+y=5,xy=6,求x^2y+xy^2的值若x-y=5,xy=6,求x^2-xy^2和x^2y+xy^2 若x/1-y/1=5,则x-2xy-y/2x+5xy-2y=? 已知2/X-1/Y=3,则(X-2Y-XY)/(5XY+6Y-3X)=? 已知2/x-1/y=3,则(2y-x+4xy)/(3x-6y-5xy)=? 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1/x+1/y=2,则(2x-xy+2y)÷(3x+5xy+3y) 若x-y=5,xy=6,则xy-xy是多少 1/x-1/y=x,求5y+xy-5y/y-xy-x=? 若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?