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a
0
= (2, 1, 1, 3), a
1
= (2, 3, 1, 1), b
0
= (1, 1, 2, 1),
b
1
= (1, 2, 1, 0)
x
1
+ x
2
− x
3
+ x
4
= 1,
2x
1
− x
2
+ x
3
+ 2x
4
= 2,
x
1
− 2x
2
+ 2x
3
+ x
4
= 1;
½
x
1
+ x
2
+ x
3
= 1,
x
1
− x
2
+ 3x
3
= 1;
x
1
− x
2
+ x
3
= 1,
x
1
+ x
2
− 2x
3
= 2,
2x
1
− x
2
+ x
3
= −1.
d) a0 = (2, 1, 1, 3), a1 = (2, 3, 1, 1), b0 = (1, 1, 2, 1), b1 = (1, 2, 1, 0). 6. Íàéòè áàçèñ íàïðàâëÿþùåãî ïîäïðîñòðàíñòâà è âåêòîð ñäâè- ãà ëèíåéíîãî ìíîãîîáðàçèÿ ðåøåíèé ñèñòåìû óðàâíåíèé: x1 + x2 − x3 + x4 = 1, a) 2x 1 − x 2 + x 3 + 2x 4 = 2, x1 − 2x2 + 2x3 + x4 = 1; ½ x1 + x2 + x3 = 1, b) x1 − x2 + 3x3 = 1; x1 − x2 + x3 = 1, c) x1 + x2 − 2x3 = 2, 2x1 − x2 + x3 = −1. 30