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Matematiklardek fikrla...
7 Jan, 17:25
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Suvni qirg'oqqa nisbatan 3 m/c tezlik bilan oqayotgan daryoning kengligi 60 m . Tinch suvga nisbatan 4 m/c tezlik bilan harakatlana oladigan qayiq qancha vaqt (c) da bu daryoni kechib o'tadi ?
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