3x-4y+3z=4 2x-2y+3z=5 x+4y-5z=6
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3x-4y+3z=4 2x-2y+3z=5 x+4y-5z=6
3x-4y+3z=4 2x-2y+3z=5 x+4y-5z=6
3x-4y+3z=4 2x-2y+3z=5 x+4y-5z=6
x=3,y=2,z=1
①3x-4y+3z=4, ②2x-2y+3z=5,③x+4y-5z=6
解方程组,得:
1.由③得:x==6-4y+5z
把x带入①,得:
3(6-4y+5z)-4y+3z==4
18-12y+15z-4y+3z==4
④7-8y+9z==0
把x带入②,得:
2(6-4y+5z)-2y+3z==5
12-8y+10z-2y+...
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①3x-4y+3z=4, ②2x-2y+3z=5,③x+4y-5z=6
解方程组,得:
1.由③得:x==6-4y+5z
把x带入①,得:
3(6-4y+5z)-4y+3z==4
18-12y+15z-4y+3z==4
④7-8y+9z==0
把x带入②,得:
2(6-4y+5z)-2y+3z==5
12-8y+10z-2y+3z==5
⑤7-10y+13z==0
2.由方程组④⑤得:
④7-8y+9z==0
⑤7-10y+13z==0
解得:z==1,y==2
把z==1,y==2带入①得
x==3
所以解得方程组,得
x==3,y==2,z==1
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