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©2026 数学クラブ http://sugaku.club/
月 日（ ）
● 有理化しなさい
[1P1-00]
(1)
2
17
(2)
23
11
(3)
23
11
(4)
13
17
(5)
2
23
(6)
23
7
(7)
5
3
(8)
2
5
(9)
2
13
(10)
23
11
(11)
11
19
(12)
7
5
(13)
17
7
(14)
7
11
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
17
2
17
×
34
=
=
17
17
×
17
(2)
23
11
23
11
×
253
=
=
11
11
×
11
(3)
23
11
23
11
×
253
=
=
11
11
×
11
(4)
13
17
13
17
×
221
=
=
17
17
×
17
(5)
2
23
2
23
×
46
=
=
23
23
×
23
(6)
23
7
23
7
×
161
=
=
7
7
×
7
(7)
5
3
5
3
×
15
=
=
3
3
×
3
(8)
2
5
2
5
×
10
=
=
5
5
×
5
(9)
2
13
2
13
×
26
=
=
13
13
×
13
(10)
23
11
23
11
×
253
=
=
11
11
×
11
(11)
11
19
11
19
×
209
=
=
19
19
×
19
(12)
7
5
7
5
×
35
=
=
5
5
×
5
(13)
17
7
17
7
×
119
=
=
7
7
×
7
(14)
7
11
7
11
×
77
=
=
11
11
×
11