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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
=
75
(2)
2
3
x
=
3
(3)
2
−2
x
=
−50
(4)
2
−5
x
=
−20
(5)
2
2
x
=
7
(6)
2
2
x
=
9
(7)
2
−3
x
=
−2
(8)
2
−3
x
=
−27
(9)
2
5
x
=
2
(10)
2
5
x
=
4
(11)
2
−6
x
=
−7
(12)
2
x
=
7
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
3
x
=
75
2
x
=
25
x
=
±
5
(2)
2
3
x
=
3
2
x
=
1
x
=
±
1
(3)
2
−2
x
=
−50
2
x
=
25
x
=
±
5
(4)
2
−5
x
=
−20
2
x
=
4
x
=
±
2
(5)
2
2
x
=
7
2
x
7
=
2
x
14
=
±
2
(6)
2
2
x
=
9
2
x
9
=
2
x
3
2
=
±
2
(7)
2
−3
x
=
−2
2
x
2
=
3
x
6
=
±
3
(8)
2
−3
x
=
−27
2
x
=
9
x
=
±
3
(9)
2
5
x
=
2
2
x
2
=
5
x
10
=
±
5
(10)
2
5
x
=
4
2
x
4
=
5
x
2
5
=
±
5
(11)
2
−6
x
=
−7
2
x
7
=
6
x
42
=
±
6
(12)
2
x
=
7
x
7
=
±