［文字サイズの変更］
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©2019 数学クラブ http://sugaku.club/
月 日（ ）
● 有理化しなさい
[1P1-00]
(1)
17
11
(2)
17
5
(3)
2
19
(4)
13
5
(5)
7
23
(6)
19
2
(7)
2
13
(8)
2
17
(9)
7
11
(10)
13
17
(11)
23
2
(12)
23
13
(13)
19
13
(14)
7
3
©2019 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
17
11
17
11
×
187
=
=
11
11
×
11
(2)
17
5
17
5
×
85
=
=
5
5
×
5
(3)
2
19
2
19
×
38
=
=
19
19
×
19
(4)
13
5
13
5
×
65
=
=
5
5
×
5
(5)
7
23
7
23
×
161
=
=
23
23
×
23
(6)
19
2
19
2
×
38
=
=
2
2
×
2
(7)
2
13
2
13
×
26
=
=
13
13
×
13
(8)
2
17
2
17
×
34
=
=
17
17
×
17
(9)
7
11
7
11
×
77
=
=
11
11
×
11
(10)
13
17
13
17
×
221
=
=
17
17
×
17
(11)
23
2
23
2
×
46
=
=
2
2
×
2
(12)
23
13
23
13
×
299
=
=
13
13
×
13
(13)
19
13
19
13
×
247
=
=
13
13
×
13
(14)
7
3
7
3
×
21
=
=
3
3
×
3