Вычислите: 1) 2/3+(-10 1/3); 2) - 3/8+ 4/7;.3) 3/5 +(- 1 5/6); 4) 2/9 + ( - 1 5/6); 5) 4/5 + ( - 2/7); 6) -9 + 2/9.

1) 2/3 + (-10 1/3)= 2/3-10 1/3=9 2/3

2) - 3/8+ 4/7= - 21/56+ 32/56=11/56

3) 3/5 +(- 1 5/6) = 18/30- 55/30=-37/30=-1 7/30

4) 2/9 + ( - 1 5/6)= 12/54 - 99/54 = -87/54= -1 33/54

5) 4/5 + ( - 2/7)= 28/35 - 10/35 = 18/35

6) -9 + 2/9= -8 9/9 + 2/9= -8 7/9