найдите произведение: 2*5/7; 11/100*3; 1/3*3; 4*2/9; 4/13*1; 4/13*26; 7*1/9; 19/1000*0; 19/1000*1500

Вычислим произведение дробей, и произведение целого числа на дробь:

2 * 5/7 = (2 * 5) / 7 = 10/7; 11/100 * 3 = (11 * 3) / 100 = 33/100; 1/3 * 3 = (1 * 3) / 3 = 3/3 = 1; 4 * 2/9 = (4 * 2) / 9 = 8/9; 4/13 * 1 = (4 * 1) / 13 = 4/13; 4/13 * 26 = (4 * 26) / 13 = 4 * 26/13 = 4 * 2 = 8; 7 * 1/9 = (7 * 1) / 9 = 7/9; 19/1000 * 0 = 0; 19/1000 * 1500 = (19 * 1500) / 1000 = 19 * 1500/1000 = 19 * 15/10 = 19 * 3/2 = (19 * 3) / 2 = 51/2 = 25 + 0.5 = 25.5.