5x+2y=x+3z ; 3x+3y=2y+2z ; x+2y+z=nx; 求n
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/19 19:37:21
xQN@.Z 4D7(&Q!1?F{[Y<3čҐ9νǪMG]WT1LwU=EWvD7mkuwRZ9f"igwrމ
[xr5A(4OI5`)b(!(wj'd=";j-1M~쵣Q\GMCCp3^]˟d^ƃ~`z[mi%Ḱ3T3 0 LrD g({{WHdGVЀɜ9es*cֹ-'qa ф\0?KbYQ a&4+]oyc߶u
5x+2y=x+3z ; 3x+3y=2y+2z ; x+2y+z=nx; 求n
5x+2y=x+3z ; 3x+3y=2y+2z ; x+2y+z=nx; 求n
5x+2y=x+3z ; 3x+3y=2y+2z ; x+2y+z=nx; 求n
n=5
将前面两式移项可得4x+2y=3z;3x+y=2z .由第一式减第二式可得x+y=z.将3x+y=2z 两边同乘以1.5,再与4x+2y=3z相减可消去z得到x=y.则最后的式子就成了x+2x+(x+y)=x+2x+x+x=5x
N无法求解
=5
1、5x+2y=x+3z------>2y=-4x+3z
2、3x+3y=2y+2z----->y=2z-3x
3、解得------>z=2x;y=x
4、x+2y+z=nx ----->n=5
5x+2y=x+3z ①
3x+3y=2y+2z ②
x+2y+z=nx ③
①-②-③=0得到:(2-n)x+3y=0,推出y=(n-2)X/3,将y带入原式得到的是x与z的关系式:
4x+2*(n-2)X/3=3z;3(n-1)X-2(n-2)X=3z;将z消除得到5X-nX=0,得出n=5
x/2=y/3=z/5 x+3y-z/x-3y+z
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
x+y=5 2x+3y-z=9 x-y+z=4
证明 :x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0
已知x/y+z=y/x+z=z/x+y,分式(x+2y+3z)/(2x+5y-2c)有意义时的值
x+2y=3x+2z=4y+z 求x:y:z
x+y/2=z+x/3=y+z/4 x+y+z=27
若x+y+z=3y=2z,则x/x+y+z=?
设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值
x+y+z=35 2x-y=5 y/3=z/2 求x,y,z
(4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊
若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z)
已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值
已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值