Question

Выполните действия: 1)(7/15-1/6)+2/5; 2)(3/8-1/9)+25/36; 3)(8/9-5/6)+2/3; 4)(7/8-13/20)+9/10; 5)(7/18-1/12)+5/6; 6)(3/4-8/15)+17/20;наверное вы знаете что это/-дробь

Answer 1

1)
7\15-1\6=14\30-5\30=9\30=3\10
3\10+2\5=3\10+4\10=7\10
2)
8\9-5\6=16\18-15\18=1\18
1\18+2\3=1\18+12\18=13\18
3)
7\18-1\12=14\36-3\36=11\36
11\36+5\6=11\36+30\36=41\36=1 5\36
4)
3\4-8\15=45\60-36\60=9\60=3\20
3\20+17\20=37\20=1 17\20

Answer 2

1) (7/15 - 1/6) + 2/5 First, find a common denominator for the fractions: 15 and 6 have a common multiple of 30. Then, convert the fractions to have a common denominator of 30: (7/15) = (14/30) (1/6) = (5/30)

Now, add the fractions: (14/30 - 5/30) + 2/5 = (9/30) + 2/5 = (3/10) + 2/5 = (3/10) + (4/10) = 7/10

2) (3/8 - 1/9) + 25/36 First, find a common denominator for the fractions: 8 and 9 have a common multiple of 72. Then, convert the fractions to have a common denominator of 72: (3/8) = (27/72) (1/9) = (8/72)

Now, add the fractions: (27/72 - 8/72) + 25/36 = (19/72) + 25/36 = (19/72) + (50/72) = 69/72 = 23/24

3) (8/9 - 5/6) + 2/3 First, find a common denominator for the fractions: 9 and 6 have a common multiple of 18. Then, convert the fractions to have a common denominator of 18: (8/9) = (16/18) (5/6) = (15/18)

Now, add the fractions: (16/18 - 15/18) + 2/3 = (1/18) + 2/3 = (1/18) + (12/18) = 13/18

4) (7/8 - 13/20) + 9/10 First, find a common denominator for the fractions: 8 and 20 have a common multiple of 40. Then, convert the fractions to have a common denominator of 40: (7/8) = (35/40) (13/20) = (26/40)

Now, add the fractions: (35/40 - 26/40) + 9/10 = (9/40) + 9/10 = (9/40) + (36/40) = 45/40 = 9/8

5) (7/18 - 1/12) + 5/6 First, find a common denominator for the fractions: 18 and 12 have a common multiple of 36. Then, convert the fractions to have a common denominator of 36: (7/18) = (14/36) (1/12) = (3/36)

Now, add the fractions: (14/36 - 3/36) + 5/6 = (11/36) + 5/6 = (11/36) + (30/36) = 41/36 = 1 5/36

6) (3/4 - 8/15) + 17/20 First, find a common denominator for the fractions: 4 and 15 have a common multiple of 60. Then, convert the fractions to have a common denominator of 60: (3/4) = (45/60) (8/15) = (32/60)

Now, add the fractions: (45/60 - 32/60) + 17/20 = (13/60) + 17/20 = (13/60) + (51/60) = 64/60 = 16/15