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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)
23
17
(2)
2
19
(3)
23
3
(4)
2
7
(5)
23
17
(6)
23
19
(7)
3
17
(8)
23
13
(9)
17
7
(10)
11
13
(11)
3
11
(12)
5
2
(13)
19
5
(14)
17
23
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
23
17
23
17
×
391
=
=
17
17
×
17
(2)
2
19
2
19
×
38
=
=
19
19
×
19
(3)
23
3
23
3
×
69
=
=
3
3
×
3
(4)
2
7
2
7
×
14
=
=
7
7
×
7
(5)
23
17
23
17
×
391
=
=
17
17
×
17
(6)
23
19
23
19
×
437
=
=
19
19
×
19
(7)
3
17
3
17
×
51
=
=
17
17
×
17
(8)
23
13
23
13
×
299
=
=
13
13
×
13
(9)
17
7
17
7
×
119
=
=
7
7
×
7
(10)
11
13
11
13
×
143
=
=
13
13
×
13
(11)
3
11
3
11
×
33
=
=
11
11
×
11
(12)
5
2
5
2
×
10
=
=
2
2
×
2
(13)
19
5
19
5
×
95
=
=
5
5
×
5
(14)
17
23
17
23
×
391
=
=
23
23
×
23