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©2025 数学クラブ http://sugaku.club/
月 日（ ）
● 有理化しなさい
[1P1-00]
(1)
2
13
(2)
3
11
(3)
23
17
(4)
19
17
(5)
11
19
(6)
13
23
(7)
2
5
(8)
17
19
(9)
19
13
(10)
3
5
(11)
3
2
(12)
13
2
(13)
3
7
(14)
7
19
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
13
2
13
×
26
=
=
13
13
×
13
(2)
3
11
3
11
×
33
=
=
11
11
×
11
(3)
23
17
23
17
×
391
=
=
17
17
×
17
(4)
19
17
19
17
×
323
=
=
17
17
×
17
(5)
11
19
11
19
×
209
=
=
19
19
×
19
(6)
13
23
13
23
×
299
=
=
23
23
×
23
(7)
2
5
2
5
×
10
=
=
5
5
×
5
(8)
17
19
17
19
×
323
=
=
19
19
×
19
(9)
19
13
19
13
×
247
=
=
13
13
×
13
(10)
3
5
3
5
×
15
=
=
5
5
×
5
(11)
3
2
3
2
×
6
=
=
2
2
×
2
(12)
13
2
13
2
×
26
=
=
2
2
×
2
(13)
3
7
3
7
×
21
=
=
7
7
×
7
(14)
7
19
7
19
×
133
=
=
19
19
×
19