［文字サイズの変更］
▼
▲
©2026 数学クラブ http://sugaku.club/
月 日（ ）
● 有理化しなさい
[1P1-00]
(1)
11
7
(2)
3
7
(3)
13
11
(4)
11
13
(5)
7
13
(6)
13
2
(7)
23
2
(8)
5
11
(9)
11
2
(10)
2
7
(11)
19
17
(12)
23
7
(13)
5
2
(14)
5
7
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
11
7
11
7
×
77
=
=
7
7
×
7
(2)
3
7
3
7
×
21
=
=
7
7
×
7
(3)
13
11
13
11
×
143
=
=
11
11
×
11
(4)
11
13
11
13
×
143
=
=
13
13
×
13
(5)
7
13
7
13
×
91
=
=
13
13
×
13
(6)
13
2
13
2
×
26
=
=
2
2
×
2
(7)
23
2
23
2
×
46
=
=
2
2
×
2
(8)
5
11
5
11
×
55
=
=
11
11
×
11
(9)
11
2
11
2
×
22
=
=
2
2
×
2
(10)
2
7
2
7
×
14
=
=
7
7
×
7
(11)
19
17
19
17
×
323
=
=
17
17
×
17
(12)
23
7
23
7
×
161
=
=
7
7
×
7
(13)
5
2
5
2
×
10
=
=
2
2
×
2
(14)
5
7
5
7
×
35
=
=
7
7
×
7