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©2025 数学クラブ http://sugaku.club/
月 日（ ）
● 次の方程式を解きなさい
[210-00]
(1)
2
3
x
=
243
(2)
2
9
x
=
6
(3)
2
5
x
=
20
(4)
2
−5
x
=
−5
(5)
2
2
x
=
162
(6)
2
−5
x
=
−45
(7)
2
−5
x
=
−5
(8)
2
10
x
=
6
(9)
2
4
x
=
3
(10)
2
−7
x
=
−10
(11)
2
3
x
=
10
(12)
2
3
x
=
27
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
3
x
=
243
2
x
=
81
x
=
±
9
(2)
2
9
x
=
6
2
x
2
=
3
x
6
=
±
3
(3)
2
5
x
=
20
2
x
=
4
x
=
±
2
(4)
2
−5
x
=
−5
2
x
=
1
x
=
±
1
(5)
2
2
x
=
162
2
x
=
81
x
=
±
9
(6)
2
−5
x
=
−45
2
x
=
9
x
=
±
3
(7)
2
−5
x
=
−5
2
x
=
1
x
=
±
1
(8)
2
10
x
=
6
2
x
3
=
5
x
15
=
±
5
(9)
2
4
x
=
3
2
x
3
=
4
x
1
3
=
±
2
(10)
2
−7
x
=
−10
2
x
10
=
7
x
70
=
±
7
(11)
2
3
x
=
10
2
x
10
=
3
x
30
=
±
3
(12)
2
3
x
=
27
2
x
=
9
x
=
±
3