1. O ABC. , , - .
2. , , , .
3. ABC BM AD O. MOA BOM . AC:AB.
1. , , , .
2. , , .
3. , .
I
1. D, - , N - D D . , , NK , , .
2. D11C1D1 1 1 30 60. .
3. 1 - 111. , .
4. .
5. D . , D .
2
1. 111 - B1C1, - 1 1. .
2. , (-2, 3), (0,1). .
3. , , .
4. 1 2, D.
5. D N - D D . .
3
1. D - D, L - D BD . .
2. BD , , = 2, BC = 3, = 60.
3. , , .
4. , , , , .
5. .
4
1. 111, . , - 11.
2. 0 - D. , - .
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3. - , , , . ,
4. , = 60, = 3, = 2.
5. , , .
5
1. 111D1, - 11. .
2. , (-3,0,4) (5,-2, -14) . , .
3. - , AM - , = 60, = 3, = 4. .
4. D D . , , = 6, D = 10, D = 60.
5. . , 1 1 .
6
1. D11C1D1 N - 1D . .
2. (2,-3,0), (1,1,0) ,
60, 45. , + .
3. - , . , , = , = .
4. .
5. , , , .
7
I. ABCA1B1C1, . 11, 1: 1 =2:1, 0 - A. .
2. (1,2,4), (3,2,1), (-1,2,7)?
3. CH - , D - , - , =3, = 4. .
4. - , α β - . ?
5. D111D1. , 1 1D.
8
1. SD . -SA D.
2. α β (-2,3,α) (β,-6,2): ) ; ) ; ) ? ) ) , - .
3. ABCD; E - D, F - AC. , EF FB , F = A.
4. , .
5. : , D, D, D D , , 2 + D2 = A2 + D2 = 2 + D2.
9
1. , , .
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2. : ) (-3,0,2), (2,1-4), (11,-2,-2-),
6) (1,0,7), (-1,2,4), (3,2,1). .
3. , , (3,0), (0,1). .
4. λ. = λ.
5. , , , .
10.
1. 1 , , 60. , ?
2. , , .
3. , (1,2,4), (3,2,1), (-1,2,7).
4. D D, - . , = 8, D = 6, D = 60.
5. .