Выполните умножение 1) 7\16 * 8\49, 2) 4\7 * 8\9, 3) 56\69 * 69\77, 4) 55\72 * 40\99.

1) 7/16 * 8/49 = 1/2 *1/7 = 1/142) 4/7 * 8/9 = 32/633) 56/69 * 69/77 = 8/1 * 1/11 = 8/114) 55/72 * 40/99 = 5/9 * 5/9 = 25/81