x-3y-2z=27 2x+3y+z=-5 3x+3y-z=4
x-3y-2z=27 2x+3y+z=-5 3x+3y-z=4
x/3+y/2=5/6-z/2 x-3y+z=6 x/6-y=7/6 全是三元一次方程.
x/3+y/2=5/6-z/2 x-3y+z=6 x/6-y=7/6 全是三元一次方程.
數(shù)學(xué)人氣：862 ℃時(shí)間：2020-03-24 11:43:08
優(yōu)質(zhì)解答
x/3+y/2=5/6-z/2 x-3y+z=6 x/6-y=7/6 對(duì)上述式子進(jìn)行整理,得2x+3y+3z=5 ①x-3y+z=6 ②x-6y=7 ③②*3- ①,得x-12y=13 ④③-④,得6y=-6 得 y=-1將y=-1代入③,得 x=1將 x=1,y=-1代入②式,得 z=2故 x=1,y=-1,z=2...
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