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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
7
x
=
10
(2)
2
4
x
=
1
(3)
2
x
=
1
(4)
2
−5
x
=
−245
(5)
2
−5
x
=
−45
(6)
2
2
x
=
200
(7)
2
2
x
=
2
(8)
2
−5
x
=
−20
(9)
2
−3
x
=
−192
(10)
2
2
x
=
32
(11)
2
3
x
=
48
(12)
2
−5
x
=
−180
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
7
x
=
10
2
x
10
=
7
x
70
=
±
7
(2)
2
4
x
=
1
2
x
1
=
4
x
1
=
±
2
(3)
2
x
=
1
x
=
±
1
(4)
2
−5
x
=
−245
2
x
=
49
x
=
±
7
(5)
2
−5
x
=
−45
2
x
=
9
x
=
±
3
(6)
2
2
x
=
200
2
x
=
100
x
=
±
10
(7)
2
2
x
=
2
2
x
=
1
x
=
±
1
(8)
2
−5
x
=
−20
2
x
=
4
x
=
±
2
(9)
2
−3
x
=
−192
2
x
=
64
x
=
±
8
(10)
2
2
x
=
32
2
x
=
16
x
=
±
4
(11)
2
3
x
=
48
2
x
=
16
x
=
±
4
(12)
2
−5
x
=
−180
2
x
=
36
x
=
±
6