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шбұрышында DE=EF=21 см. DE қабырғасының орта перпендикуляры DF қабырғасын K нүктесінде қияды. DF қабырғасының ұзындығын анықтаңыз, егер EKF үшбұрышының периметрі 60 см-ге тең болса​

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leo1233121
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1. the pyramids were built 3,000 years ago. 2. the statue of liberty was given to america in 1876 by the people of france. 3. the 1665 great fire of london was described by samuel pepys in his diary. 4. this chair was made in the eighteenth century. 5. this shirt was made in turkey. 6. the first heart transplant operation was done by dr christian barnard. 7. £23,000 were won in the state lottery by me. 8. durum wheat is used to make spaghetti.

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