= (1/2a + 3/8a) - (3/4b + 4/7b= (4/8a + 3/8a) - (21/28b + 16/28b= 7/8a - 37/28= 7/8a - 37/28b
Таким образом, 1/2a - 3/4b + 3/8a + 4/7b = 7/8a - 37/28b.
= (1/2a + 3/8a) - (3/4b + 4/7b
= (4/8a + 3/8a) - (21/28b + 16/28b
= 7/8a - 37/28
= 7/8a - 37/28b
Таким образом, 1/2a - 3/4b + 3/8a + 4/7b = 7/8a - 37/28b.