3x+2y+z=9 x-3y-2z=1 -x+4y+4z=5
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3x+2y+z=9x-3y-2z=1-x+4y+4z=53x+2y+z=9x-3y-2z=1-x+4y+4z=53x+2y+z=9x-3y-2z=1-x+4y+4z=5三个方程之间有点【混淆】.假定9
3x+2y+z=9 x-3y-2z=1 -x+4y+4z=5
3x+2y+z=9 x-3y-2z=1 -x+4y+4z=5
3x+2y+z=9 x-3y-2z=1 -x+4y+4z=5
三个方程之间 有点【混淆】.假定 9 ,x和 1 ,-x 是分属两个方程的部分,不是”9x“;“1-x" .
代入法、加减法 和行 列式法,也不知道你有没有要求.
(2)*2+(3) x-2y=7
(1)*2+(2) 7x+y=19 => 14x+2y=38
=> 15x=45 => x=3 => y=-2 => z=9-3*3+2*2=4
∴ x=3、y=-2、z=4
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{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2