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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
=
−180
(2)
2
4
x
=
6
(3)
2
−5
x
=
−245
(4)
2
−3
x
=
−48
(5)
2
−7
x
=
−9
(6)
2
−3
x
=
−12
(7)
2
5
x
=
500
(8)
2
2
x
=
8
(9)
2
8
x
=
1
(10)
2
−7
x
=
−2
(11)
2
6
x
=
7
(12)
2
−3
x
=
−108
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
−5
x
=
−180
2
x
=
36
x
=
±
6
(2)
2
4
x
=
6
2
x
3
=
2
x
6
=
±
2
(3)
2
−5
x
=
−245
2
x
=
49
x
=
±
7
(4)
2
−3
x
=
−48
2
x
=
16
x
=
±
4
(5)
2
−7
x
=
−9
2
x
9
=
7
x
3
7
=
±
7
(6)
2
−3
x
=
−12
2
x
=
4
x
=
±
2
(7)
2
5
x
=
500
2
x
=
100
x
=
±
10
(8)
2
2
x
=
8
2
x
=
4
x
=
±
2
(9)
2
8
x
=
1
2
x
1
=
8
x
1
2
=
±
4
(10)
2
−7
x
=
−2
2
x
2
=
7
x
14
=
±
7
(11)
2
6
x
=
7
2
x
7
=
6
x
42
=
±
6
(12)
2
−3
x
=
−108
2
x
=
36
x
=
±
6