Question

45*1516=
719*57=
925*815+715*925=
напишіть як розвязувати

Answer 1

4/5*15/16=3/4 (4 и 16 сокращаем на 4; 5и 15 на 5)
7/19*57=7/19*57/1=7*3=21(19 и 57 сокращаем на 19)

Answer 2

4/5 * 15/16 = 4/5 * (3*5) / (4*4) = 3/4,
7/19 * 57 = 7/19 * (19*3) = 3*7 = 21,
9/25 * 8/15 + 7/15 * 9/25 = 9/25 * (8/15 + 7/15) = 9/25 * 15/15 = 9/25 * 1 = 9/25