Ответ:
1) 1/10 +1/5 = 1/10 + 2/10 = 3/10
2) 2/7 + 1/3 = 6/21 + 7/21 = 13/21
3) 1/3 + 1/2 = 2/6 + 3/6 = 5/6
4) 3/4 - 2/9 = 27/36 - 8-36 = 19/36
5) 1/4 + 5/6 = 3/13 + 10/12 = 13/12 = 1 1/12
6) 5/8 - 1/6 = 15/24 - 4/24 = 11/24
7) 4 - 6/13 = 52/13 - 6/13 = 46/13
8) 8 - 3 2/5 = 8 - 17/5 = 40/5 - 17/5 = 23/5
9) 3/4 - 3/10 = 15/20 - 6/20 = 9/20
10) 5/12 - 7/18 = 15/36 - 14/36 = 1/36
11) 6/21 - 3/14 + 2/7 = 2/7 - 3/14 + 2/7 = 4/7 - 3/14 = 8/14 - 3/14 = 5/14
12) 1/2 - (3/5 - 1/6) = 1/2 - 13/30 = 1/15
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Answers & Comments
Ответ:
1) 1/10 +1/5 = 1/10 + 2/10 = 3/10
2) 2/7 + 1/3 = 6/21 + 7/21 = 13/21
3) 1/3 + 1/2 = 2/6 + 3/6 = 5/6
4) 3/4 - 2/9 = 27/36 - 8-36 = 19/36
5) 1/4 + 5/6 = 3/13 + 10/12 = 13/12 = 1 1/12
6) 5/8 - 1/6 = 15/24 - 4/24 = 11/24
7) 4 - 6/13 = 52/13 - 6/13 = 46/13
8) 8 - 3 2/5 = 8 - 17/5 = 40/5 - 17/5 = 23/5
9) 3/4 - 3/10 = 15/20 - 6/20 = 9/20
10) 5/12 - 7/18 = 15/36 - 14/36 = 1/36
11) 6/21 - 3/14 + 2/7 = 2/7 - 3/14 + 2/7 = 4/7 - 3/14 = 8/14 - 3/14 = 5/14
12) 1/2 - (3/5 - 1/6) = 1/2 - 13/30 = 1/15