2x+y-z=-3,3x+2y+z=2,x-5y+2z=17
2x+y-z=-3,3x+2y+z=2,x-5y+2z=17
快 快 我感激不盡!
快 快 我感激不盡!
數(shù)學(xué)人氣：689 ℃時(shí)間：2020-03-26 08:03:47
優(yōu)質(zhì)解答
2x+y-z=-3 (1)3x+2y+z=2 (2)x-5y+2z=17 (3)(1)+(2)得5x+3y=-1 (4)(1)×2+（3）得5x-3y=11 (5)(4)+(5)得10x=10∴x=1把x=1代入(4)得y=-2把x=1,y=-2代入(1)得2-2-z=-3∴z=3∴方程組的解是x=1y=-2z=3...
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