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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
5
x
=
45
(2)
2
−4
x
=
−3
(3)
2
−5
x
=
−500
(4)
2
−2
x
=
−2
(5)
2
3
x
=
147
(6)
2
−2
x
=
−2
(7)
2
−2
x
=
−162
(8)
2
5
x
=
180
(9)
2
6
x
=
6
(10)
2
2
x
=
162
(11)
2
2
x
=
2
(12)
2
10
x
=
6
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
5
x
=
45
2
x
=
9
x
=
±
3
(2)
2
−4
x
=
−3
2
x
3
=
4
x
1
3
=
±
2
(3)
2
−5
x
=
−500
2
x
=
100
x
=
±
10
(4)
2
−2
x
=
−2
2
x
=
1
x
=
±
1
(5)
2
3
x
=
147
2
x
=
49
x
=
±
7
(6)
2
−2
x
=
−2
2
x
=
1
x
=
±
1
(7)
2
−2
x
=
−162
2
x
=
81
x
=
±
9
(8)
2
5
x
=
180
2
x
=
36
x
=
±
6
(9)
2
6
x
=
6
2
x
=
1
x
=
±
1
(10)
2
2
x
=
162
2
x
=
81
x
=
±
9
(11)
2
2
x
=
2
2
x
=
1
x
=
±
1
(12)
2
10
x
=
6
2
x
3
=
5
x
15
=
±
5