819 Вычислите:а)1/10+1/100 б)21/100+1/10 в)1/3+1/4
а) 1/10+1/100 =11/100
б)21/100+1/10=31/100
в)1/3+1/4= 7/12
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а) 1/10+1/100 =11/100
б)21/100+1/10=31/100
в)1/3+1/4= 7/12