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. 1 . MN DEF DF . DE S. 1-2 (1121 ;1222), DE (1,2).
- Q . DEF 3-4 (3141 ;3242). N (N1,N2).
N . . .
( ) (,,,D,E,F) N. , . , .
2 2,3,4
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3 1:1. 3.
:
1.
: A (28, 105, 45), B (80, 50, 64), (10, 70, 12).
1. SABC, ABC, | SA | = 80 , | SB | = 65 . AB 60.
2. SAC .
3. SC .
2.
: A (80, 20, 50), B (50, 10, 10), (0, 50, 70).
1. SABC, S A, B, C. 2 S , 1.
2. SA .
2 1 |
3. SAC .
3.
: Σ, DE (D (50, 39, 27), E (30, 10,95), C (55, Y, 19), F (75, Y, 30).
1. SABC, ABC Σ. SF 70 .
2. SBC .
3. SA .
4.
: DE (D (85, 6, 34), E (45, 58, 4)), A (17, 23, 66), S (100, 62, Z).
1. SABC, ABC (| AB | = | AC |), BC DE 50 . 80 .
2. SA .
3. SA BC .
5.
: A (80, 25, 65), B (40, 5, 10), C (20, 55, 40), DE (D (90,35, 35), E (75, 45, 5)).
1. SABC, ABC. S DE A B.
2. SA .
3. SA BC .
6.
: A (115, 65, 55), S (30, 120, 100).
1. SABCD, 2 45, 1 30.
2. SA .
3. SD AB .
7.
: SD (S (130, 5, 70), D (100, 45, 30)).
1. SABC, SD. , ABC, 30 . A 15 .
2. SC AB .
3. SAC .
8.
: DE (D (0, 65, 40), E (110, 75, 10)), A (70, 30, 80).
1. SABC, BC DE.
2. AB SC .
3. SC .
9.
: Λ (D, E, F) (D (100, 0, 0,), E (0, 50, 0), F (0, 0, 100)), A (60, Y, 30), B (20, Y, 75), C (5, Y, 5).
|
|
1. SABC, ABC Λ. S A, B, C 1 65 .
2. SAB .
3. SC .
10.
: SD (S (30, 120, 80), D (90, 50, 45)), B (98, 32, Z).
1. SABC, SD.
2. SC AB .
3. SAC .
11.
: Σ(D, E, F) (D (140, 0, 0), E (0, 60, 0), F (0, 0, 90)) S (110, Y, 80), A (70, Y, 20), B (40, Y, 60), C (10, Y, 5).
1. SABC, ABC, Σ. 110 .
2. BC .
3. SAC .
12.
: FA (F (90, 70, 60), A (40, 40, 35)), C (20, Y, 90).
1. ABCDA'B'C'D'. ABCD AC. AA' FA. 60 .
2. .
3. .
13.
: Ω(A, B, C) (A (100, 80, 40), B (50, 30, 30), C (30, 40, 50)).
1. SABCD, ABCD, | CD | = | AB |. AD BC. 1 90 .
2. SA .
3. SCD .
14.
: SD (S (130, 5, 70), D (100, 45, 30)).
1. . SABC, SD. 50 , B 2 45 .
2. SA .
3. SB .
15.
: S (110, 75, 62), L, DE (D (68, 37, 10), E (50, 11, 71)), A (96, 14, Z).
1. SABC, L.
2. SC .
3. SAC .
16.
: ABC (A (50, 100, 60), B (30, 100, 30), C (20, 70, 65)).
1. ABCDEF ABC. | l | = 60 1 30, 2 45.
2. BC .
3. AD BC .
|
|
17.
: A (20, 50, 32), B (38, 85, 65), C (90, 30, 83).
1. SABC. | SB | = 85 , | SC | = 70 , BC 60.
2. .
3. SA .
18.
: A (120, 50, 30), B (100, 10, 70), C (70, 60, 10), DE (D (50, 10, 75), E (10, 55, 35)).
1. SABC, S DE AB AC.
2. SAC .
3. AB SC .
19.
: NB (N (100, 60, 70), B (50, 30, 45)) D (25, 45, Z).
1. ABCDA'B'C'D'. ABCD BD. BB' NB, 60 .
2. .
3. AD 2 .
20.
: SD (S (30, 90, 75), D (95, 45, 50)), B (120, 65, Z).
1. SABC, SD.
2. AB .
3. .
21.
: A (80, 60, 70), B (70, 30, 100), C (30, 70, 90).
1. SABC, S OX A C.
2. SB .
3. ABC .
22.
: R(D, E, F) (D (100, 0, 0), E (0, 100, 0), F (0, 0, 57)),
BC (B (58, Y, 3), C (13, Y, 12)).
1. SABC, R, S 1 2.
2. SAC .
3. SC AB .
23.
: Σ(A, C, F) (A (18, 25, 42), C (52, 35, 6), F (100, 0, 0)).
1. , ABCD Σ. AC . 60 .
2. AA'B'B 2 .
3. .
24.
: (A, B, C) (A (110, 10, 40), B (80, 50, 70), C (50, 40, 30)), DE (D (120, 25, 60), E (30, 50, 45)), K (20, 80, 50).
1. SKLMN, S , DE.
2. SKN .
3. SK .
25.
: Θ(D, E, F) (D (120, 0, 0), E (0, 60, 0), F (0, 0, 75)), AB (A (20, Y, 50), B (52, Y, 10)).
1. SABC. ABC (| AB | = | AC |), Θ, C 2. SA 80 .
2. SB .
3. SA SBC .
26.
: Ω(D, E, F) (D (130, 120, 70), E (80, 80, 110), F (60, 105,100)), S (60, 90, Z), B (5, 20, Z).
1. SABC , 100 . S Ω. ABC Ω, ZS > ZB.
2. ABC .
3. SA BC .
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|
27.
: Σ(D, E, F) (D (130, 0, 0), E (0, 70, 0), F (0, 0, 110)) Θ (K, L, N) (K (0, 0, 110), L (70, 70, 110), N (80, 80, 110)), S (35, 45, 25), B (40, Y, 70) C(0, Y, 20).
1. SABC, ABC ( B).
BC Σ. A Σ Θ.
2. SA BC .
3. AC .
:
2
(. 3):
1. S(A, EF) . . 2 4(5^π 1 Ù 4çç S(AEF), x14 ⊥ h1, 1 5(5^ 4Ù 5|| S(A, EF)), x45 || Sπ 4. A5B5C5. . , . .
: | x14A4 | = | x12A2 |; | x45A5 | = | x14A1 |.
2. Q, S5. . 4 6(6^ 5Ù || Q). S6. B6 S5S6 , . 5 6, 1 2. ,
3 |
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3
SAC , .( 4) : , 4, 5.
SAC h 4 ( 1,4^ h1) (. . 3). . , ( . 4 ). SAC 4. S4A4. ( 5 ( x45 || S4A4)), 5 S5A5C5 = SAC.
4
, . , , .
(. . 5). A'1'1 = A1C1 x, B'1, S' 1. ( A' 1 B'1 = A1B1, '1B'1 = C1B1 A'1S'1 = A1S1, '1S'1 = C1S1). A'2, B'2, ' 2, S' 2. A' 1 , , A'2. B'2, C'2, S'2. 1. A'' 2 '' 2 = A'2C'2 x, B''2, S''2. ( A''2B''2 = A'2B'2, ''2B''2 = C'2B'2 A'' 2 S'' 2 = A'2S' 2, ''2S''2 = C'2S'2). , , A''1 = ''1, B''1,, S''1). A''2 , A A'1, A''1. B''1, C''1, S''1. , , α.
4 |
. 6 16 . t 5 SC, 30 2 45 1.
1. S (S1, S2) : SA || 1 (S1A1 || x12) 2 30 SB || 2(S1B1 || x12) 1 45. | SA | = | SB |.
5 i
2. SB i 1, SA i' 2 .
3. SC, 1 45 2 30.
3. 5
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1. A B. λ || π 2, . A (A1) B (B1).
2. 1 2, . S || π 1 ^ ^2(S 2), R, r. 1 11 21, 12 22.
3. - β γ, 3, 4, 5, 6
4. ( ).
, , π 2. , O .
1. A2, B2, A1, B1 A B, .
2. , Rmin. , . Rmin . , π 2 . 12 12, . 11 21.
6, |
3. , Rmin, O (O2), (52 = 62; 32 = 42). .
4. , π 2 , M (M2) = N (N2), π 1 .
5. ( )
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1,12,22 | 2,14,20 |
3,16,21 | 4,18,25 |
6,13 | 5,11,24 |
3
7,15 | 8,17,27 |
9,19,23 | 10,25 |
9. 2() |
3
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1,13,22 | 3,17,26 |
2,15,24 | 4,19,27 |
5,18,25 | 6,16,23 | ||
8,12 | 7,14 | ||
10,11,21 | 9,20 | ||
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2. ( 2.305-68), ( 2.306-68).
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12 - 6g60.58 7798-70; 12 7.5 5915-70; 16 6g120.58 22032-78.
: 12.01 11371-78, 12 , 01 ( ).
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1,19,27 | 16 | 7798-70 | 5915-70 | 11371-78 | ||||
2,10,18 | 181,5 | - | 7796-70 | 15521-70 | 6402-70 | |||
3,17,25 | 20 | 7805-70 | 5927-70 | 11371-68 | ||||
4,16,24 | 161,5 | - | 7798-70 | 5918-73 | 6402-70 | |||
5,15,23 | 18 | 7796-70 | 15521-70 | 11371-78 | ||||
6,14,22 | 201,5 | - | 7805-70 | 5918-73 | 6402-70 | |||
7,13,21 | 16 | - | 7805-70 | 5927-70 | 6402-70 | |||
8,12,20 | 181,5 | 7798-70 | 5918-73 | 11371-78 | ||||
9,11,19 | 20 | 7796-70 | 1521-70 | 11371-78 |
4.
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1,11,26 | 161,5 | - | - | 22036-76 | 5918-73 | 6402-70 | ||
2,12,20 | 18 | - | 22034-76 | 5915-70 | 11371-68 | |||
3,13,21 | 201,5 | - | - | 22032-76 | 5918-73 | 6402-70 | ||
4,14,22 | 16 | - | 22038-76 | 5916-73 | 11371-78 | |||
5,15,23 | 181,5 | - | - | 22036-76 | 5918-73 | 6402-70 | ||
6,16,24 | 20 | - | 22034-76 | 5915-70 | 11371-68 | |||
7,17,25 | 161,5 | - | 22040-76 | 5918-73 | 11371-78 | |||
8,10,18 | 18 | - | - | 22036-76 | 5916-73 | 6402-70 | ||
9,19,27 | 201,5 | - | 22032-76 | 5918-73 | 11371-78 |
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