x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/27 22:04:23
x)ЮЮA[#C8"bQЩI*'V~
I>lTmVa
jA.\xdJ[cl5uM+5yvP9fc|>e㳹}ӟM|E-p~?
4h8Jgxޏ`@L3U@tN
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=?
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
即2x+3y=21 (1)
2x+5y=27 (2)
(2)-(1)
2y=6
所以y=3
x=(27-5y)/2=6
x=6,y=3
由条件可得方程组:2x+3y=21 (1)
2x+5y=27 (2)
解之得:x=6;y=3
x+x+y+y+y+y+y=27 相减x+x+y+y+y=21
y+y=6 y=3 x=6
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=?
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
{(x,y) |x|+|y|
x>y?x:y
化简 x / y(x+y) - y / x(x+y) =
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
y=x(x
x^/y-x-y^/y-x化简.
化简x(y-x)-y(x-y)
行列式计算 x y x+y y x+y x x+y x y|x y x+y ||y x+y x ||x+y x y |
y/(x+y)-x/(x-y)
x+x+x+x+y+y+y=56
x+x+x+y+y=6.4 y+y+y+x+x=7.1 怎么算?
二元函数f(x,y)=x+y/x-y,求f(y/x,x/y)
x-y/x+y=(x-y)²/x²-y²(x≠y)
(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