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2x4y3z 3x2y5z

x=4,y=1 1ʽ x-y=3 2ʽ x+y=5 2ʽ-1ʽ y=1 2ʽ+1ʽ x=4 (2)2x+y=32 2x+y=0 -3/7, 22/7 0, 5 1, 1

ã 3x-2y-5z=0 12x-8y-20z=0 1 2x-5y+4z=0 10x-25y+20z=0 2 1+2 22x-33y=0 22x=33y y=2/3x 3x-2y-5z=0 15x-10y-25z=0 3 2x-5y+4z=0 4x-10y+8z=0 4 3-4 11x-33z=0 11x=33z z=1/3x 3x^2+2y^2+5z^2/5x^2+y...

һ˸ ֳɰ˸ʰ

ⷽ飺 1 2 1 x=3,y=4,z=5 2 x=-1,y=,z=3

x-2y+3z=3 (1) 2x+y+5z=8 (2) 3x-y-3z=-22 (3) (1)+(2)2 5x+13z=19 (4) (2)+(3) 5x+2z=-14 (5) (4)-(5) 11z=33 z=3 x=(19-13z)/5=-4 y=8-2x-5z=1

3x+4y=15 2y-z=2 x+2z=9 y=(2+z)/2 x=9-2z 3(9-2z)+4+2z=15 z=4 y=3 x=1 x+y+z=8 (1) 2x+3y-z=6 (2) 3x-y+z=8 (3) (1)+(2) 3x+4y=14 (1)-(3) -2x+2y=0 x=y x=2 y=2 z=4 2x+y+z=16 (1) 3x+2y+4z=44 (2) x+3y+5z=52 6x+3y+3z=48 x-2z=-12 -5x+2z=4...

Եk١4ʱΨһz=1/(k-4)x=1/(4-k)y=2/(k-4)+2. k=-4ʱ. k=4ʱ޽.

Ԫ1ʽ36x+15y+9z=27 (2)ʽ26x-4y+10z=22,Ȼ󣬣1ʽ(2)ʽõ19y-z=5,ٽ1ʽ5õ10x+25y+15z=45 (3)ʽ2õ10x-12y+14z=26,ʽõ37y+z=19 ˽ղŵõĽӵõ56y=24...

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