高手帮忙解6道三元一次方程(1)3x-y+z=3 2x+y-3z=11 x+y+z=12(2)4x+y-z=12 3x+2y+z=5 x-y+5z=1(3)2x+7y=3 3x-z=1 -y+3z=4(4)x+y=3 2x-y+2z=2 x-y-z=3(5)x-2y-3z+18=0 x+3y-2z-8=0 x+y+2z-24=0(6)x=2y 2x+y+2z=1 2x-z=7
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![高手帮忙解6道三元一次方程(1)3x-y+z=3 2x+y-3z=11 x+y+z=12(2)4x+y-z=12 3x+2y+z=5 x-y+5z=1(3)2x+7y=3 3x-z=1 -y+3z=4(4)x+y=3 2x-y+2z=2 x-y-z=3(5)x-2y-3z+18=0 x+3y-2z-8=0 x+y+2z-24=0(6)x=2y 2x+y+2z=1 2x-z=7](/uploads/image/z/5472984-48-4.jpg?t=%E9%AB%98%E6%89%8B%E5%B8%AE%E5%BF%99%E8%A7%A36%E9%81%93%E4%B8%89%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%281%293x-y%2Bz%3D3+2x%2By-3z%3D11+x%2By%2Bz%3D12%282%294x%2By-z%3D12+3x%2B2y%2Bz%3D5+x-y%2B5z%3D1%283%292x%2B7y%3D3+3x-z%3D1+-y%2B3z%3D4%284%29x%2By%3D3+2x-y%2B2z%3D2+x-y-z%3D3%285%29x-2y-3z%2B18%3D0+x%2B3y-2z-8%3D0+x%2By%2B2z-24%3D0%286%29x%3D2y+2x%2By%2B2z%3D1+2x-z%3D7)
高手帮忙解6道三元一次方程(1)3x-y+z=3 2x+y-3z=11 x+y+z=12(2)4x+y-z=12 3x+2y+z=5 x-y+5z=1(3)2x+7y=3 3x-z=1 -y+3z=4(4)x+y=3 2x-y+2z=2 x-y-z=3(5)x-2y-3z+18=0 x+3y-2z-8=0 x+y+2z-24=0(6)x=2y 2x+y+2z=1 2x-z=7
高手帮忙解6道三元一次方程
(1)3x-y+z=3 2x+y-3z=11 x+y+z=12
(2)4x+y-z=12 3x+2y+z=5 x-y+5z=1
(3)2x+7y=3 3x-z=1 -y+3z=4
(4)x+y=3 2x-y+2z=2 x-y-z=3
(5)x-2y-3z+18=0 x+3y-2z-8=0 x+y+2z-24=0
(6)x=2y 2x+y+2z=1 2x-z=7
高手帮忙解6道三元一次方程(1)3x-y+z=3 2x+y-3z=11 x+y+z=12(2)4x+y-z=12 3x+2y+z=5 x-y+5z=1(3)2x+7y=3 3x-z=1 -y+3z=4(4)x+y=3 2x-y+2z=2 x-y-z=3(5)x-2y-3z+18=0 x+3y-2z-8=0 x+y+2z-24=0(6)x=2y 2x+y+2z=1 2x-z=7
(1)3x-y+z=3
2x+y-3z=11
5x+4z=14
3x-y+z=3
x+y+z=12
4x+2z=15
8x+4z=30
3x=16,x=16/3,z=(15-64/3)/2=-19/6
y=12-16/3+19/6=(72-32+19)/6=59/6
(2)8x+2y-2z=24
3x+2y+z=5
5x-3z=19
3x+2y+z=5
2x-2y+10z=2
5x+11z=7
5x-3z=19
14z=-12,z=-6/7,5x=19+18/7=151/7,x=151/35
y=x+5z-1=151/35-150/35-1=-34/35
(3)
z=3x-1,y=3z-4=9x-3-4=9x-7
2x+63x-49=3,65x=46
倒
(4)
x+y=3 2x-y+2z=2 x-y-z=3
y=3-x,x-3+x-z=3,z=2x-6
2x-3+x+4x-12=2,7x=15+2=17,
再倒一次
(5)
x-2y-3z=-18 x+3y-2z-8=0 x+y+2z-24=0
x+y+2z=24
3y+5z=42
x+3y-2z=8
x+y+2z=24
-2y+4z=16
6y+10z=84
-6y+12z=48
22z=132,z=6,3y=42-30,y=4
x=24-4-12=8
这题还可以
(6)
x=2y 2x+y+2z=1 2x-z=7
z=2x-7,y=x/2
4x-14+2x+x/2=1
13x/2=15,x=30/13,晕
y=15/13
z=60/13-7=-31/13
真是练功夫啊,对不起啦,
全都只需要消元,如果会做懒得做,那就不要做了,没有新意
如果不会做,建议仔细理解二元一次方程,类推代入消元过程完成题目
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