Вычислите 1)9 2/7 + 11 3/14 2) 5 3/8+2 5/6 3) 4 7/8 +6 5/12 4) 3 1/9 + 7 3/5 5) 6 3/5 + 8 1/15 7) 1 3/4 + 5 1/3 8) 15 - 3 4/7 9) 12 7/15 -7 3/20 10) 6 3/14 - 11/21 11) 9 7/12 - 4 5/9 12 ) 12 3/8 - 5 5/6 13) 8 4/7 - 3 7/9 заранее спасибо
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