接下列三元一次方程组(1)y=2x-7 (2)3x-y+2z=3 (3)3x-y+z=4 (4)x+y=3 (5)x+2
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接下列三元一次方程组
(1)y=2x-7 (2)3x-y+2z=3 (3)3x-y+z=4 (4)x+y=3 (5)x+2y=4
5x+3y+2z=4 2x+y-3z=11 2x+3y-2z=12 y+z=5 2x+3z=13
3x-4z=4 x+y+z=12 3x+2y=66 x+z=5 3y+z=6
(1)y=2x-7 (2)3x-y+2z=3 (3)3x-y+z=4 (4)x+y=3 (5)x+2y=4
5x+3y+2z=4 2x+y-3z=11 2x+3y-2z=12 y+z=5 2x+3z=13
3x-4z=4 x+y+z=12 3x+2y=66 x+z=5 3y+z=6
![接下列三元一次方程组(1)y=2x-7 (2)3x-y+2z=3 (3)3x-y+z=4 (4)x+y=3 (5)x+2](/uploads/image/z/16994072-56-2.jpg?t=%E6%8E%A5%E4%B8%8B%E5%88%97%E4%B8%89%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%BB%84%281%29y%3D2x-7+%282%293x-y%2B2z%3D3+%283%293x-y%2Bz%3D4+%284%29x%2By%3D3+%285%29x%2B2)
(1)y=2x-7
5x+3y+2z=4
3x-4z=4 .z=(3x-4)/4
5x+3(2x-7)+(3x-4)/2=4
25x/2=27
x=54/25
y=-67/25
z=31/50
5x+3y+2z=4
3x-4z=4 .z=(3x-4)/4
5x+3(2x-7)+(3x-4)/2=4
25x/2=27
x=54/25
y=-67/25
z=31/50
求解三元一次方程组:{x+y/2=y+z/3=z+x/4 x+y+z=27
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