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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
−7
x
=
−5
(2)
2
−5
x
=
−80
(3)
2
−
x
=
−7
(4)
2
5
x
=
7
(5)
2
5
x
=
20
(6)
2
3
x
=
108
(7)
2
−3
x
=
−27
(8)
2
5
x
=
1
(9)
2
2
x
=
7
(10)
2
−3
x
=
−3
(11)
2
−2
x
=
−200
(12)
2
x
=
1
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
−7
x
=
−5
2
x
5
=
7
x
35
=
±
7
(2)
2
−5
x
=
−80
2
x
=
16
x
=
±
4
(3)
2
−
x
=
−7
2
x
=
7
x
7
=
±
(4)
2
5
x
=
7
2
x
7
=
5
x
35
=
±
5
(5)
2
5
x
=
20
2
x
=
4
x
=
±
2
(6)
2
3
x
=
108
2
x
=
36
x
=
±
6
(7)
2
−3
x
=
−27
2
x
=
9
x
=
±
3
(8)
2
5
x
=
1
2
x
1
=
5
x
5
=
±
5
(9)
2
2
x
=
7
2
x
7
=
2
x
14
=
±
2
(10)
2
−3
x
=
−3
2
x
=
1
x
=
±
1
(11)
2
−2
x
=
−200
2
x
=
100
x
=
±
10
(12)
2
x
=
1
x
=
±
1