Вычислите: а) 1/4+3/10; б)3/5-1/6; в)7/10-2/15; г)5/12+3/8

Question

Вычислите:
а) 1/4+3/10; б)3/5-1/6; в)7/10-2/15; г)5/12+3/8

Answer 1

А) 1/4 + 3/10 = (5+6)/20 = 11/20
б) 3/5 - 1/6 = (18-5)/30 = 13/30
в) 7/10 - 2/15 = (21-4)/30 = 17/30
г) 5/12 + 3/8 = (10+9)/24 = 19/24

Comments

спс

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А откуда 21 и 10 и 9