x+y=5,则（-x^2-y^2/2xy）^2除以（x-y/-xy）^2的值是多少?

来源：学生作业帮助网 编辑：作业帮 时间：2024/05/09 13:31:53
x+y=5,则（-x^2-y^2/2xy）^2除以（x-y/-xy）^2的值是多少?

x+y=5,则（-x^2-y^2/2xy）^2除以（x-y/-xy）^2的值是多少?
x+y=5,则（-x^2-y^2/2xy）^2除以（x-y/-xy）^2的值是多少?

x+y=5,则（-x^2-y^2/2xy）^2除以（x-y/-xy）^2的值是多少?
25/4

x+y=5, x=5-y,
(x+y)²=25, x²+y²=25-2xy,
x²+y²-2xy=25-4xy, (x-y)²=25-4xy,
则（-x^2-y^2/2xy）^2除以（x-y/-xy）^2
＝【（x^2+y^2/2xy）×（xy/x-y）】^2
＝【(x²+y²)/2(x-y)】²
＝(25-2xy)²/[4(25-4xy)]
＝

若xy/x+y=2,则3x-5xy+3y/-x+3xy-y=?/是分之 已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________? 若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)= 已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值 函数f(xy,x+y)=x^2+xy+y^2,则df(x,y)=? f(xy,x-y)=x^2+3xy+y^2,则f(x,y)=? X-Y=5,XY=2,则Y/X + X/Y=? 已知x+y=2,xy=-5则x分之y+y分之x等于 2x^+xy-y^-4x+5y-6=? 已知x+y=5,xy=2则x^2y+xy^2=( ) 已知x+y=1,xy=1/5,则x^2y=xy^2 若 x+y=5,xy=-50 则x^2y+xy^2 =( ) 若x-y=1,xy=5,则x^2y-xy^2＝ 已知x+y=5,xy=-3,则x^2y+xy^2, (1/x)+(1/y)=5,则(2x-5xy+2y)/(x+2xy+y)=? 若x/1-y/1=5,则x-2xy-y/2x+5xy-2y=? 已知1/x+1/y=5,则2x-5xy+2y/x+2xy+y