Выполните сложение дробей, указанных на изображении.

a) 4/10 + 3/10 = (4 + 3)/10 = 7/10; b) 1/2 + 1/2 = (1 + 1)/2 = 2/2 = 1; c) 7/5 + 7/5 = (7 + 7)/5 = 14/5 = 2 4/5; d) 2/3 + 3/3 = (2 + 3)/3 = 5/3 = 1 2/3; e) 4/5 + 1/2 = (8/10 + 5/10) = 13/10 = 1 3/10.