Вычислите: а) 3\5 + 3\7 + 9\7 × 4\15 , б) ( 7\9 - 1\6 ) : 2\9 *21\22 , В) 7\8+5\8 × 1\3 +2\3 г) (1\6 + 3\14) : ( 5\21 - 1/14) Заранее СПАСИБО!!!!!!!!!!!! :)
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