x-y=3,(x+y)(x+y)=25,求xy/xx+yy的值?
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/24 03:12:39
x)Э5ѨЮF:66UTW g{Ӯ`LT Y0s!**mѤt-m- Z*m!zu6<ٽi{mMZ`栉 `|
x-y=3,(x+y)(x+y)=25,求xy/xx+yy的值?
x-y=3,(x+y)(x+y)=25,求xy/xx+yy的值?
x-y=3,(x+y)(x+y)=25,求xy/xx+yy的值?
x-y=3
平方
x²-2xy+y²=9
x²+2xy+y²=(x+y)²=25
相加
2(x²+y²)=34
x²+y²=17
2xy=x²+y²-9=8
xy=4
所以原式=4/17
4/17
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
(x+y-5)*(x+y-5)+(x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
(x+y)(x+y-10)+25=0,且x-y=3,求x,y
(x+y)(x+y-10)+25=0,且x-y=3,求x,y
化简 x / y(x+y) - y / x(x+y) =
推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做.
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
化简 x-y/(y-x)^3=
(x+y)(2x-3y)=?
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
y=x(x
y(x+y)+(x-y)²-(x+y)(x-y),其中x=-1/3,y=3
已知3x =2y 求x/x+y+y/x-y-y²/x²-y²