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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
[211-00]
(1)
2
(
x
−
1
)
−
8
=
0
(2)
2
(
x
−
6
)
=
4
(3)
2
(
x
＋
7
)
−
25
=
0
(4)
2
(
x
−
7
)
=
49
(5)
2
(
x
−
3
)
=
25
(6)
2
(
x
−
1
)
−
1
=
0
(7)
2
(
x
−
1
)
=
4
(8)
2
(
x
−
1
)
=
1
(9)
2
(
x
−
4
)
=
64
(10)
2
(
x
−
4
)
=
4
(11)
2
(
x
−
1
)
−
4
=
0
(12)
2
(
x
−
3
)
=
4
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
−
1
)
−
8
=
0
x
−
1
2
=
±
2
x
2
=
1
±
2
(2)
2
(
x
−
6
)
=
4
x
−
6
=
±
2
x
=
6
±
2
x
=
8
，
4
(3)
2
(
x
＋
7
)
−
25
=
0
x
＋
7
=
±
5
x
=
−
7
±
5
x
=
−2
，
−12
(4)
2
(
x
−
7
)
=
49
x
−
7
=
±
7
x
=
7
±
7
x
=
14
，
0
(5)
2
(
x
−
3
)
=
25
x
−
3
=
±
5
x
=
3
±
5
x
=
8
，
−2
(6)
2
(
x
−
1
)
−
1
=
0
x
−
1
=
±
1
x
=
1
±
1
x
=
2
，
0
(7)
2
(
x
−
1
)
=
4
x
−
1
=
±
2
x
=
1
±
2
x
=
3
，
−1
(8)
2
(
x
−
1
)
=
1
x
−
1
=
±
1
x
=
1
±
1
x
=
2
，
0
(9)
2
(
x
−
4
)
=
64
x
−
4
=
±
8
x
=
4
±
8
x
=
12
，
−4
(10)
2
(
x
−
4
)
=
4
x
−
4
=
±
2
x
=
4
±
2
x
=
6
，
2
(11)
2
(
x
−
1
)
−
4
=
0
x
−
1
=
±
2
x
=
1
±
2
x
=
3
，
−1
(12)
2
(
x
−
3
)
=
4
x
−
3
=
±
2
x
=
3
±
2
x
=
5
，
1