Выполните действия:1) 5/6*9/15-5/12*4/15; 2) 7/18*9/14+1/3*6/7; 3) 9/20*2/3+5/14*7/25; 4) 3 3/4*2/5-3 6/25*5/27;5) 2

1) 5/6 * 9/15 - 5/12 * 4/15 = 3/6 - 1/9 = 27/54 - 6/54 = 21/54 = 7/18;

2) 7/18 * 9/14 + 1/3 * 6/7 = 1/4 + 2/7 = 7/28 + 8/28 = 15/28;

3) 9/20 * 2/3 + 5/14 * 7/25 = 3/10 + 1/10 = 4/10 = 2/5;

4) 3 3/4 * 2/5 - 3 6/25 * 5/27 = 15/4 * 2/5 - 81/25 * 5/27 = 3/2 - 3/5 = 15/10 - 6/10 = 9/10;

5) 2 2/5 * 5/6 - 3/4 * 1 2/3 = 12/5 * 5/6 - 3/4 * 5/3 = 2 - 5/4 = 8/4 - 5/4 = 3/4;

6) 1 17/28 * 14/9 + 14/25 * 5/7 = 45/28 * 14/9 + 14/25 * 5/7 = 5/2 + 2/5 = 25/10 + 4/10 =

= 29/10 = 2 9/10.