Вычислите₍12/7*8/14₎+1/2*3/5; ₍1+1,1/2*2/5₎:₍2/5*1/3*2/3₎; 3/2*7/5*13/11*4/6*10/14*22/26

1) 12/7 * 8/14 + 1/2 * 3/5 = (2 * 6 * 8) / (7 * 2 * 7) + 3 / (2 * 5) = 48/49 + 3/10 = 480/490 + 147/490 = 627/490 = 1 137/490;

2) (1 + 1 1/2 * 2/5) : (2/5 * 1/3 * 2/3) = (1 + 3/2 * 2/5) : (2 * 2) / (5 * 3 * 3) = (1 + 3/5) : 4/45 = 1 3/5 : 4/45 = 8/5 : 4/45 = 8/5 * 45/4 = (4 * 2 * 5 * 9) / (5 * 4) = 2 * 9 = 18;

3) 3/2 * 7/5 * 13/11 * 4/6 * 10/14 * 22/26 = 1.

1) 3/2 * 4/6 = (3 * 2 * 2) / (2 * 3 * 2) = 1;

2) 13/11 * 22/26 = (13 * 11 * 2) / (11 * 13 * 2) = 1;

3) 7/5 * 10/14 = (7 * 5 * 2) / (5 * 2 * 7) = 1;

4) 1 * 1 * 1 = 1.