3x+2y-z=1 x-2y+2z=5 5x-2y+5z=11 解方程组,
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3x+2y-z=1x-2y+2z=55x-2y+5z=11解方程组,3x+2y-z=1x-2y+2z=55x-2y+5z=11解方程组,3x+2y-z=1x-2y+2z=55x-2y+5z=11解方程
3x+2y-z=1 x-2y+2z=5 5x-2y+5z=11 解方程组,
3x+2y-z=1 x-2y+2z=5 5x-2y+5z=11 解方程组,
3x+2y-z=1 x-2y+2z=5 5x-2y+5z=11 解方程组,
3x+2y-z=1 x-2y+2z=5 5x-2y+5z=11
3x+2y-z=1 ①
x-2y+2z=5 ②
5x-2y+5z=11 ③
①-3*②得 8y-7z=-14 ④
5*①-3*③得 16y-20z=-28 ⑤
2*④-⑤得 6z=0 z=0
代入z到④,得y=-7/4
代入y和z到①,得x=3/2
因此 x=3/2 y=-7/4 z=0
o(∩_∩)o
z=3x+2y-1
代入 2式
7x+2y=1
代入3式
5x+2y=4
运算,x=-3/2
y=23/4
z=6
x/2=y/3=z/5 x+3y-z/x-3y+z
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
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x+y+z=-5,3x+y+z=1,4x+3y+2z=-2快
3x+2y+z=14 ,x+y+z=10,z+2x+3y=1 5