Задачи по алгебре. Рудман Р.М. - 27 стр.

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222.
2x
1
+ 3x
2
+ 11x
3
+ 5x
4
= 2,
x
1
+ x
2
+ 5x
3
+ 2x
4
= 1,
2x
1
+ x
2
+ 3x
3
+ 2x
4
= 3,
x
1
+ x
2
+ 3x
3
+ 4x
4
= 3.
223.
2x
1
+ 5x
2
+ 4x
3
+ x
4
= 20,
x
1
+ 3x
2
+ 2x
3
+ x
4
= 11,
2x
1
+ 10x
2
+ 9x
3
+ 7x
4
= 40,
3x
1
+ 8x
2
+ 9x
3
+ 2x
4
= 37.
224.
3x
1
+ 4x
2
+ x
3
+ 2x
4
+ 3 = 0,
3x
1
+ 5x
2
+ 3x
3
+ 5x
4
+ 6 = 0,
6x
1
+ 8x
2
+ x
3
+ 5x
4
+ 8 = 0,
3x
1
+ 5x
2
+ 3x
3
+ 7x
4
+ 8 = 0.
225.
7x
1
+ 9x
2
+ 4x
3
+ 2x
4
2 = 0,
2x
1
2x
2
+ x
3
+ x
4
6 = 0,
5x
1
+ 6x
2
+ 3x
3
+ 2x
4
3 = 0,
2x
1
+ 3x
2
+ x
3
+ x
4
= 0.
226.
6x + 5y 2z + 4t + 4 = 0,
9x y + 4z t 13 = 0,
3x + 4y + 2z 2t 1 = 0,
3x 9y + 2t 11 = 0.
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