Вычислите : 2/3 : ( - 2 ) ;( - 3/4

1) 2/3 : (- 2) = - 2/3 * 1/2 = - 2/6 = - 1/3;

2) (- 3/4) : 1 1/2 = - 3/4 : (1 * 2 + 1)/2 = - 3/4 : 3/2 = - 3/4 * 2/3 = - 6/12 = - 1/2;

3) - 4/5 : 8 = - 4/40 = -1/10;

4) 4 : (- 1/2) = - 4 * 2 = - 8;

5) 5 : (- 5/8) = - 5 : 5/8 = - 5 * 8/5 = - 8;

6) (- 6) : (- 3/5) = 6 * 5/3 = 2 * 5 = 10;

7) (- 5/6) : (- 5/12) = 5/6 * 12/5 = 12/6 = 2;

8) - (3 * 4 + 3)/4 : (1 * 2 + 1)/2 = - 15/4 : 3/2 = - 15 * 2/12 = - 5/2;

9) (1 * 9 + 7)/9 : (- (2 * 3 + 2)/3) = - 16/9 : 8/3 = - 16/9 * 3/8 = - 2/3;

10) (- (8 * 5 + 2)/5) : 7 = - 42/35 = - 6/5;

11) (- (7 * 2 + 1)/2) : (- 5) = 15/2 : 5 = 3/2;

12) (4 * 3 + 2)/3 : (1 * 6 + 1)/6 = 14/3 : 7/6 = 14/3 * 6/7 = 4.