Сделайте значение выражения: 1) 2/15+(-3/10) 2) -2/3+13/15 3) 13/16+(-9/32) 4) -4

Запишем решение для последующего выражения. 

1) 2/15 + (-3/10) = 4/30 - 9/30 = -5/30.

2) -2/3 + 13/15 = -10/15 + 13/15 = 3/15 = 1/5.

3) 13/16 + (-9/32) = 26/32 - 9/32 = 17/31.

4) -4 5/9 + (-7 1/6) = -41/9 - 43/6 = -82/18 - 129/18 = -217/18 = -12 1/18.

5) -5 7/8 + (-6 3/10) = -47/8 - 63/10 = -235/40 - 252/40 = -487/40 = -11 7/40.

6) -5 13/18 + 12 11/12 = -103/18 + 155/12 = -206/36 + 465/36 = 259/36 = 7 7/36.

7) -13 + 7 3/16 = -5 13/16.

8) -2 3/8 + (-1 5/9) = -19/8 - 14/9 = -171/72 - 112/72 = -283/72 = -3 67/72.

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

10) -2 9/20 +5 7/30 = -49/20 + 157/30 = -147/60 + 314/60 = 167/60 = 2 47/60.

11) -5 1/4 + 1 3/8 = -21/4 + 11/8 = -42/8 + 11/8 = -31/8 = -3 7/8.

12) 4 3/7 + (-8 9/14) = 31/7 - 121/14 = 62/14 - 121/14 = -59/14 = 4 3/14.