Question

Решить
23(6,9c - одна целая одна вторая d)- 4,8(58c-2,5d)

Answer 1

2/3(6,9c 1 1/2d) - 4,8(5/8c - 2,5d) =
= 2/3 * 69/10c - 2/3 * 3/2d - 48/10 * 5/8c + 48/10 * 25/10d =
= 23/5c - d  - 3c + 12d = 4,6c - 3c + 11d = 1,6c + 11d