Question

Помогите! Срочно!Даю 10 баллов​

Answer 1

1/5m + 7/20m - 1/4m =
(1/5 * 1/6) + (7/20 * 1/6) - (1/4 * 1/6)=
1/30 + 7/120 - 1/24 =
4/120 + 7/120 - 5/120 = 6/120 = 1/20