Найдите сумму. 1) 3(7/16) + 2(5/32) = 3 + 7/16 + 2 + 5/32 = 2) 1(1/12) + 3(4/9) = 3) 4(1/6) + 5(3/14) + 6(2/21) =

1) 3(7/16) + 2(5/32) = 3 + 7/16 + 2 + 5/32 = (3 + 2) + (7/16 + 5/32) = 5(19/32).2) 1(1/12) + 3(4/9) = 1(3/36) + 3(16/36) = 4(19/36).3) 4(1/6) + 5(3/14) + 6(2/21) = 4(7/42 + 5(9/42) + 6(4/42) = 15(20/42) = 15(10/21).