［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)
5
3
(2)
7
19
(3)
11
5
(4)
5
11
(5)
19
11
(6)
7
17
(7)
5
7
(8)
17
7
(9)
13
3
(10)
7
2
(11)
5
3
(12)
19
23
(13)
13
3
(14)
23
17
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
5
3
5
3
×
15
=
=
3
3
×
3
(2)
7
19
7
19
×
133
=
=
19
19
×
19
(3)
11
5
11
5
×
55
=
=
5
5
×
5
(4)
5
11
5
11
×
55
=
=
11
11
×
11
(5)
19
11
19
11
×
209
=
=
11
11
×
11
(6)
7
17
7
17
×
119
=
=
17
17
×
17
(7)
5
7
5
7
×
35
=
=
7
7
×
7
(8)
17
7
17
7
×
119
=
=
7
7
×
7
(9)
13
3
13
3
×
39
=
=
3
3
×
3
(10)
7
2
7
2
×
14
=
=
2
2
×
2
(11)
5
3
5
3
×
15
=
=
3
3
×
3
(12)
19
23
19
23
×
437
=
=
23
23
×
23
(13)
13
3
13
3
×
39
=
=
3
3
×
3
(14)
23
17
23
17
×
391
=
=
17
17
×
17