Question

解方程组3x+y+2z=8,x+y+z=5,2x+3y+4z=7

Answer 1

1) Y=8-3X-2Z

2) Z=5-X-Y=5-X-(8-3X-2Z) => Z=3-2X

3) Y=2+X

4) 2X+3(2+X)+4(3-2X)=7 => X=11/3

5) Y=17/3

6) Z=-13/3

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