Выполните сложения; 1) 8 5/12+ 72/3 2)6 1/3+3 3/5 4)5 4/9+2 7/12+4 2/9+5/12 5) 10 2/9+13 5/7+3 8/9+ 42/7 6) 15 17/18+3 8/9+7/9+7/18   С ОБЪЯСНЕНИЕМ 
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