已知(2x-y-1)^2+|xy-2|=0求4x^2y-2xy^2+x^2y^2的值好的有赏!

来源：学生作业帮助网编辑：六六作业网时间：2024/11/25 15:59:19

已知(2x-y-1)^2+|xy-2|=0求4x^2y-2xy^2+x^2y^2的值好的有赏!已知(2x-y-1)^2+|xy-2|=0求4x^2y-2xy^2+x^2y^2的值好的有赏!已知(2x-

已知(2x-y-1)^2+|xy-2|=0求4x^2y-2xy^2+x^2y^2的值好的有赏!
已知(2x-y-1)^2+|xy-2|=0求4x^2y-2xy^2+x^2y^2的值
好的有赏!

已知(2x-y-1)^2+|xy-2|=0求4x^2y-2xy^2+x^2y^2的值好的有赏!
平方和绝对值都大于等于0,相加等于0,若有一个大于0,则另一个小于0,不成立.
所以两个都等于0
所以2x-y-1=0,2x-y=1
xy-2=0,xy=2
4x^2y-2xy^2+x^2y^2
=2xy(2x-y)+(xy)^2
=2*2*1+2^2
=8

2x-y-1=0 xy=2 算出x,y

(2x-y-1)^2+|xy-2|=0 2x-y-1=0 xy-2=0 2x-y=1 xy=2 4x^2y-2xy^2+x^2y^2 =xy(4x-2y+xy) =2[2(2x-y)+2] =2[2*1+2] =8

已知x+y=1,xy=-2,则x²y+xy²-2xy 已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y) 已知xy-x-y=11,求(xy-1)^2+(x+y-2)(x+y-2xy)的值. 已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= .已知:x-y=1,xy=-2.求:(-2xy+2 x+3y)-(3xy+2y-2x)-(x+4y+xy)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=1,xy=1/5,则x^2y=xy^2 已知x y=1,xy=-3,求2xy-4x 4(y-2(xy-x)) 已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+2(xy+y)的值已知x-xy=8,xy-y=-9,求x+y-2xy的值已知x(x-1)-(x²-y)=-3,求(x²y+xy²)÷xy-2y 已知x²+xy=2,xy+y²=1,求x²+2xy+y²的值已知1/x-1/y=2,求3x+7xy-3y/2x-3xy-2y答案是1/x-1/y=2(y-x)/xy=2 得：x-y=-2xy(3x+7xy-3y)/(2x-3xy-2y)=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy)=xy/(-7xy)=-1/7 谁能帮我解释一下=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy) 是怎已知x-y=3,xy=1,求（-2x+2x+3y)-(3xy+2y-2x)-(x+4y+xy) 已知实数xy满足x²﹢y²-xy+2x-y+1=0求xy 【数学】已知 1/x-1/y=3 求 5x-xy-5y / x-2xy-y=?已知 1/x=1/y 求 2x-3xy-2y / x-2xy-y=? 已知1/x+1/y=5,求x+y+3xy/2x-4xy+2y的值,已知1/x+1/y=5,x+y+3xy/2x-4xy+2y的值, 已知1/x=1/y=6,则3x-2xy+3y/3xy+x+y=?已知1/x+1/y=6,则3x-2xy+3y/3xy+x+y=?