5x+2y=x+3z ; 3x+3y=2y+2z ; x+2y+z=nx; 求n
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5x+2y=x+3z;3x+3y=2y+2z;x+2y+z=nx;求n5x+2y=x+3z;3x+3y=2y+2z;x+2y+z=nx;求n5x+2y=x+3z;3x+3y=2y+2z;x+2y+z=
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
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