1)4/9*5/8*7,2 2)1 1/2*2 2/11+2 3/4*2 2/11-2 2/11*3 5/6

1) 4/9 * 5/8 * 7,2 = 4/9 * 5/8 * 72/10 = (4 * 5 * 72)/(9 * 8 * 10) = 72/(9 * 2 * 2) = 8/4 = 2;

Ответ: 2.

2) 1 1/2 * 2 2/11 + 2 3/4 * 2 2/11 - 2 2/11 * 3 5/6 = 2 2/11 * (1 1/2 + 2 3/4 - 3 5/6) = (2 * 11 + 2)/11 * ((1 * 2 + 1)/2 + (2 * 4 + 3)/4 - (3 * 6 + 5)/6) = (22 + 2)/11 * (3/2 + (8 + 3)/4 - (18 + 5)/6) = 24/11 * (3/2 + 11/4 - 23/6) = 24/11 * (18/12 + 33/12 - 46/12) = 24/11 * (18 + 33 - 46)/12 = 24/11 * 5/12 = 10/11.

Ответ: 10/11.