вычислите: 1) 27+(-72); 2) 7,7+(-2,8); 3) 5,5+(-5,5); 4) 7,7+(-12,8); 5) 4целых3/10+(-7целых11/15); 6) 9целых1/6+(-7целых7/15); 7) -7целых1/12+6целых8/15
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