Найдите произведение: 1) 6/11*4/7 2) 7/20*10/21 3) 8/9*27/32 4) 23/28*49/46 5) 34/86*43/51 6) 7/18*80/77

Первая дробь.

6/11 * 4/7 = 6 * 4/11 * 7 = 24 / 77;

Вторая дробь.

7/20 * 10/21 = 7 * 10/20 * 21 = 70/420 = 1 * 70/6 * 70 = 1/6;

Третья дробь.

8/9 * 27/32 = 8 * 27/9 * 32 = 216/288 = 3 * 72/4 * 72 = 3/4

Четвертая дробь

23/28 * 49/46 = 23 * 49/28 * 46 = 1127/1288 = 7 * 161/8 * 161 = 7/8;

Пятая дробь.

34/86 * 43/51 = 34 * 43/86 * 51 = 1462/4386 = 1 * 1462/3 * 1462 = 1/3;

Шестая дробь.

7/18 * 80/77 = 7 * 80/18 * 77 = 560/1386 = 40 * 14/99 * 14 = 40/99.