Пошаговое объяснение:
1. 6/11 : (-6) = -6/11 : 6/1 = -6/11*1/6= -1/11
2. 3 3/7 : (-8) = -24/7 : 8/1 = -24/7*1/8= -3/7
3. -3 1/2 : (-2) = 7/2:2/1= 7/2*1/2=7/4=1 3/4
4. 3/16 : (-5) = -3/16 : 5/1 = -3/16*1/5=-3/80
5. -3 1/4 : (-1) = 13/4 : 1 = 13/4
6. -1 2/3 : (-2) = 5/3 : 2/1 = 5/3*1/2=5/6
7. -7 : (-3) = 7/1 : 3/1 = 7/1*1/3=7/3=2 1/3
8. 4 : (-20) = -4:20 = -4/1 : 20/1 = -4/1*1/20=1/5 (или 0.2)
9. -8 : (-5) = 8:5= 8/1 : 5/1 = 8/1*1/5=8/5=1 3/5
10. -3/8 : 4 = -3/8 : 4/1 = -3/8*1/4=3/32
11. -1/5 : (-3) = 1/5 : 3/1 = 1/5*1/3=1/15
12. 4/15 : (-5) = -4/15 : 5/1 = -4/15*1/5=4/75
Вроде так.
1) 7/8 и 1/14 - общий знаменатель 56
56 : 8 = 7 - доп.множ. к 7/8 = (7·7)/(8·7) = 49/56
56 : 14 = 4 - доп.множ. к 1/14 = (1·4)/(14·4) = 4/56
7/8 и 1/14 = 49/56 и 4/562) 3/8 и 1/10 - общий знаменатель 40
40 : 8 = 5 - доп.множ. к 3/8 = (3·5)/(8·5) = 15/40
40 : 10 = 4 - доп.множ. к 1/10 = (1·4)/(10·4) = 4/40
3/8 и 1/10 = 15/40 и 4/403) 7/12 и 8/9 - общий знаменатель 36
36 : 12 = 3 - доп.множ. к 7/12 = (7·3)/(12·3) = 21/36
36 : 9 = 4 - доп.множ. к 8/9 = (8·4)/(9·4) = 32/36
7/12 и 8/9 = 21/36 и 32/364) 3/10 и 5/6 - общий знаменатель 30
30 : 10 = 3 - доп.множ. к 3/10 = (3·3)/(10·3) = 9/30
30 : 6 = 5 - доп.множ. к 5/6 = (5·5)/(6·5) = 25/30
3/10 и 5/6 = 9/30 и 25/30