Выполните вычитание : 1) 7\8 - ( -3\10) ; 4) -5\9 - (-3\4); 2) 11\12 - 17\18; 5) 3 11/12 - ( -4. 4\9); 3) -3\7 - 9\14

1) 7\\8 - (-3\\10) = (7 * 5) / (8 * 5) - (-3 * 4) / (10 * 4) = 35/40 - (-12/40) = 35/40 + 12/40 = 47/40 = 1 7/40. 

2) 11\\12 - 17\\18 = (11 * 3) / (12 * 3) - (17 * 2) / (18 * 2) = 33/36 - 34/36 = -1/36.

3) -3\\7 - 9\\14 = (-3 * 2) / (7 * 2) - 9/14 = -6/14 - 9/14 = -15/14 = - 1 1/4.

4) -5\\9 - (-3\\4) = (-5 * 4) / (9 * 4) - (-3 * 9) / (4 * 9) = -20/36 - (-27/36) = -20/36 + 27/36 = 7/36. 

5) 3 11/12 - (-4 4\\9) = 47/12 - (-40/9) = 47/12 + 40/9 = (47 * 3) / (12 * 3) + (40 * 4) / (9 * 4) = 141/36 + 160/36 = 301/36 = 8 13/13. 

6) 4 5\\17 - 6 = 4 5/17 - 5 17/17 = -1 12/17.