Question

помогите пожайлуста решить!!!!!

Answer 1

а) 5/7 * 21/25 = 1/1 * 3/5 = 3/5
б) 2 1/12 * 0,8 = 25/12 * 8/10 = 25/12 * 4/5 = 5/3 * 1/1 = 5/3 = 1 2/3
в) 2 1/4 * 7/9  + 2/9 * 2 1/4 = 2 1/4 * ( 7/9 + 2/9) = 2 1/4 * 9/9 = 2 1/4 * 1 = 2 1/4