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©2026 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
=
320
(2)
2
9
x
=
5
(3)
2
−2
x
=
−8
(4)
2
2
x
=
32
(5)
2
3
x
=
147
(6)
2
−3
x
=
−12
(7)
2
−5
x
=
−45
(8)
2
2
x
=
128
(9)
2
−2
x
=
−128
(10)
2
3
x
=
2
(11)
2
4
x
=
9
(12)
2
3
x
=
48
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
5
x
=
320
2
x
=
64
x
=
±
8
(2)
2
9
x
=
5
2
x
5
=
9
x
1
5
=
±
3
(3)
2
−2
x
=
−8
2
x
=
4
x
=
±
2
(4)
2
2
x
=
32
2
x
=
16
x
=
±
4
(5)
2
3
x
=
147
2
x
=
49
x
=
±
7
(6)
2
−3
x
=
−12
2
x
=
4
x
=
±
2
(7)
2
−5
x
=
−45
2
x
=
9
x
=
±
3
(8)
2
2
x
=
128
2
x
=
64
x
=
±
8
(9)
2
−2
x
=
−128
2
x
=
64
x
=
±
8
(10)
2
3
x
=
2
2
x
2
=
3
x
6
=
±
3
(11)
2
4
x
=
9
2
x
9
=
4
x
3
=
±
2
(12)
2
3
x
=
48
2
x
=
16
x
=
±
4