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Batalion4164
@Batalion4164
August 2022
2
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Выполните сложение: a)4/9+3/5 б) 7/18+7/12 в)11/25+13/30 г)5/38+7/19
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66Mr69
А) 1. 2/45
б) 35/36
в) 131/150
г) 1/2
13 votes
Thanks 19
lidochka085
a)4/9+3/5=(4*5+3*9)/45=(20+27)/45=47/45=1ц 2/45
б)
7/18
+
7/12
=
7·2/18·2
+
7·3/12·3
=
14/36
+
21/36
=
14 + 21/36
=
35/36
в)
1/25
+
13/30
=
11·6/25·6
+
13·5/30·5
=
66/150
+
65/150
= (
66 + 65)/150
=
131/150
г)
5/38
+
7/19
=
5/38
+
7·2/19·2
= 5/3
8
+
14/38
=
5 + 14/38
=
19/38
=
1/
2
29 votes
Thanks 36
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Answers & Comments
б) 35/36
в) 131/150
г) 1/2
б) 7/18 + 7/12 = 7·2/18·2 + 7·3/12·3 = 14/36 + 21/36 = 14 + 21/36 = 35/36
в)1/25 + 13/30 = 11·6/25·6 + 13·5/30·5 = 66/150 + 65/150 = (66 + 65)/150 = 131/150
г)5/38 + 7/19 = 5/38 + 7·2/19·2 = 5/38 + 14/38 = 5 + 14/38 = 19/38 = 1/2