Вычислите значение выражения: 2)-2/3+13/15 3) 13/16+(-9/32) 4) -4 5/9+(-7 1/6) 5)

Вычислим значение выражений: 

2) -2/3 + 13/15 = (-2  * 5 + 13)/15 = (-10 + 13)/15 = 3/15 = 1/5; 

3) 13/16 + (-9/32) = (13 * 2 - 9)/32 = (26 - 9)/32 = 17/32; 

4) -4 5/9 + (-7 1/6) = -4 - 7 - 5/9 - 1/6 = -11 - (10 + 3)/18 = -11 13/18; 

5) -5 7/8 + (-6 3/10) = -11 - 7/8 - 3/10 = -11 - (35 + 12)/40 = -12 7/40; 

6) -5 13/18 + 12 11/12 = 7 + 11/12 - 13/18 = 7 + (33 - 26)/36 = 7  7/36;

7) -13 + 7 3/16  = -6 + 3/16 = -5 13/16;

8) -2 3/8 + (-1 5/9) = -3 - 3/8 - 5/9 = -3 - (27 + 40)/72 = -3 67/72; 

9) -8 + 4 5/22 = -4 + 5/22 = -3 17/22;

10) -2 9/20 + 5 7/30 = 3 + 7/30 - 9/20 = 3 + (14 - 27)/30 = 3 - 13/30 = 2 17/30; 

11) -5 1/4 + 1 3/8 = -5 2/8 + 1 3/8 = -4 + 1/8 = -3 7/8; 

12) 4 3/7 + (-8 9/14) = -4 + 3/7 - 9/14 = -4 + 6/14 - 9/14 = -4 - 3/14 = - 4 3/14.