а) 6/7 + 0,3 = 6/7 + 3/10 = (60 + 21) / 70 = 81/706/7 - 0,3 = 6/7 - 3/10 = (60 - 21) / 70 = 39/70
б) 17/20 + 0,7 = 17/20 + 7/10 = (34 + 140) / 40 = 174/20 = 87/1017/20 - 0,7 = 17/20 - 7/10 = (34 - 140) / 40 = -106/20 = -53/10
в) 5/9 + 0,4 = 5/9 + 4/10 = (50 + 36) / 90 = 86/90 = 43/455/9 - 0,4 = 5/9 - 4/10 = (50 - 36) / 90 = 14/90 = 7/45
г) 3/5 + 0,2 = 3/5 + 2/10 = (30 + 10) / 50 = 40/50 = 4/53/5 - 0,2 = 3/5 - 2/10 = (30 - 10) / 50 = 20/50 = 2/5
д) 13/25 + 0 = 13/2513/25 - 0 = 13/25
е) 2/13 + 0,07 = 2/13 + 7/100 = (200 + 91) / 1300 = 291/13002/13 - 0,07 = 2/13 - 7/100 = (200 - 91) / 1300 = 109/1300
ж) 0,21 + 3/8 = 21/100 + 24/100 = 45/100 = 9/200,21 - 3/8 = 21/100 - 24/100 = -3/100
з) 0,13 + 4/5 = 13/100 + 80/100 = 93/1000,13 - 4/5 = 13/100 - 80/100 = -67/100
и) 0,01 + 6/17 = 1/100 + 6/17 = (117 + 6) / 100 = 23/17000,01 - 6/17 = 1/100 - 6/17 = (117 - 600) / 1700 = -583/1700
а) 6/7 + 0,3 = 6/7 + 3/10 = (60 + 21) / 70 = 81/70
6/7 - 0,3 = 6/7 - 3/10 = (60 - 21) / 70 = 39/70
б) 17/20 + 0,7 = 17/20 + 7/10 = (34 + 140) / 40 = 174/20 = 87/10
17/20 - 0,7 = 17/20 - 7/10 = (34 - 140) / 40 = -106/20 = -53/10
в) 5/9 + 0,4 = 5/9 + 4/10 = (50 + 36) / 90 = 86/90 = 43/45
5/9 - 0,4 = 5/9 - 4/10 = (50 - 36) / 90 = 14/90 = 7/45
г) 3/5 + 0,2 = 3/5 + 2/10 = (30 + 10) / 50 = 40/50 = 4/5
3/5 - 0,2 = 3/5 - 2/10 = (30 - 10) / 50 = 20/50 = 2/5
д) 13/25 + 0 = 13/25
13/25 - 0 = 13/25
е) 2/13 + 0,07 = 2/13 + 7/100 = (200 + 91) / 1300 = 291/1300
2/13 - 0,07 = 2/13 - 7/100 = (200 - 91) / 1300 = 109/1300
ж) 0,21 + 3/8 = 21/100 + 24/100 = 45/100 = 9/20
0,21 - 3/8 = 21/100 - 24/100 = -3/100
з) 0,13 + 4/5 = 13/100 + 80/100 = 93/100
0,13 - 4/5 = 13/100 - 80/100 = -67/100
и) 0,01 + 6/17 = 1/100 + 6/17 = (117 + 6) / 100 = 23/1700
0,01 - 6/17 = 1/100 - 6/17 = (117 - 600) / 1700 = -583/1700