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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)
2
19
(2)
3
2
(3)
19
17
(4)
19
5
(5)
11
3
(6)
23
19
(7)
17
3
(8)
2
13
(9)
7
3
(10)
19
5
(11)
11
23
(12)
23
19
(13)
17
13
(14)
7
11
©2019 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
19
2
19
×
38
=
=
19
19
×
19
(2)
3
2
3
2
×
6
=
=
2
2
×
2
(3)
19
17
19
17
×
323
=
=
17
17
×
17
(4)
19
5
19
5
×
95
=
=
5
5
×
5
(5)
11
3
11
3
×
33
=
=
3
3
×
3
(6)
23
19
23
19
×
437
=
=
19
19
×
19
(7)
17
3
17
3
×
51
=
=
3
3
×
3
(8)
2
13
2
13
×
26
=
=
13
13
×
13
(9)
7
3
7
3
×
21
=
=
3
3
×
3
(10)
19
5
19
5
×
95
=
=
5
5
×
5
(11)
11
23
11
23
×
253
=
=
23
23
×
23
(12)
23
19
23
19
×
437
=
=
19
19
×
19
(13)
17
13
17
13
×
221
=
=
13
13
×
13
(14)
7
11
7
11
×
77
=
=
11
11
×
11