- 4:7. 16. .
- CD AB BOA , O,B,D , O,A,C . AB =5, OB =3 OD =12, CD.
- CD AB BOA , O,B,D , O,A,C. AB =5, OA =5 OC =8, CD.
- CD AB BOA . O,B,D , O,A,C . OA=2, OB=5 OD=15, C
- CD AB BOA , O,B,D O,A,C . OA=5, AC=3 BD= 6, OB.
- CD AB BOA , O,B,D , O,A,C . OA=2, AC=4 BD=6, OD
- 7 ; . , 28.
- AC BD ABCD BC = 6 AD = 16 K L , CK: KA = BL: LD = 7: 4. KL.
- 1,8 1,2; , 1,5 1,2, . , .
- AB CD ABCD E. AED, AB = 3, BC = 10, CD = 4, AD = 12.
- ABCD 1. K CD C AK.
- ABCD AB = 420. BC E , BE:EC = =5:7, DE, AB F. BF.
- 10, , , 20.
, , . . - ABCD AD=3 BC = 18. M AC, AM:MC=1:2. , M , BD N. MN.
- M N BC CD ABCD. AM BN O. .
- AB ABCD , , B, , BC AD. , , BC = 10 AD = 20.
- 36. , , . , .
- , 48, 16, 5:9, . .
- , 30, 10, , , . .
- ABC A M. ABC, M BC 4, AM = 5.
- ABC A M. M BC, A 5, BC 8.
- 12 18. , , , 40?
- 6 8, , . .
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