X+y-z=6;x-3y+2z=0;3x+2y-z=4
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X+y-z=6;x-3y+2z=0;3x+2y-z=4X+y-z=6;x-3y+2z=0;3x+2y-z=4X+y-z=6;x-3y+2z=0;3x+2y-z=4将1式变形为z=x+y-6带入到2式和
X+y-z=6;x-3y+2z=0;3x+2y-z=4
X+y-z=6;x-3y+2z=0;3x+2y-z=4
X+y-z=6;x-3y+2z=0;3x+2y-z=4
将1式变形为z=x+y-6带入到2式和3式,可以构成2元一次方程组进行解答
另外不要习惯从网上找答案,这样不利于你的学习.
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4式-5式*4 算出z=
在代入4式,算出y=
在代入1式 算出x=
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X+y-z=6;x-3y+2z=0;3x+2y-z=4
x-y+z=0,2x+y-2z=6,3x-y-z=3求解,
{x+y+z=0 4x+2y+z=3 9x+3y+z=6
{x+y-2z=-3 2x+6y+z=2 x+y+z=0
{x+y+z=0 {4x+2y+z=3 {9x+2y+z=6
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1.{x:y:z=3:4:5 2x+3y-5z=-142.{x-y-z=-1 3x+5y+7z=11 4x-y+2z=-13.{x+y=1 x+z=0 2x+y+2z=44.{x-y+z=-3 2x-y-z=-2 -3x+y+z=-15.{x-y+z=-3 3x+y-4z=6 2x+y-z=36.{x-2y+5z=16 2x+y-5z=7 2x-y+z=38