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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)
19
23
(2)
17
7
(3)
5
23
(4)
2
23
(5)
13
19
(6)
5
19
(7)
17
23
(8)
11
3
(9)
5
11
(10)
2
17
(11)
19
11
(12)
7
11
(13)
17
5
(14)
17
2
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
19
23
19
23
×
437
=
=
23
23
×
23
(2)
17
7
17
7
×
119
=
=
7
7
×
7
(3)
5
23
5
23
×
115
=
=
23
23
×
23
(4)
2
23
2
23
×
46
=
=
23
23
×
23
(5)
13
19
13
19
×
247
=
=
19
19
×
19
(6)
5
19
5
19
×
95
=
=
19
19
×
19
(7)
17
23
17
23
×
391
=
=
23
23
×
23
(8)
11
3
11
3
×
33
=
=
3
3
×
3
(9)
5
11
5
11
×
55
=
=
11
11
×
11
(10)
2
17
2
17
×
34
=
=
17
17
×
17
(11)
19
11
19
11
×
209
=
=
11
11
×
11
(12)
7
11
7
11
×
77
=
=
11
11
×
11
(13)
17
5
17
5
×
85
=
=
5
5
×
5
(14)
17
2
17
2
×
34
=
=
2
2
×
2