［文字サイズの変更］
▼
▲
©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
＋
7
)
=
1
(2)
2
(
x
＋
9
)
=
7
(3)
2
(
x
−
5
)
=
6
(4)
2
(
x
＋
1
)
=
1
(5)
2
(
x
−
5
)
=
64
(6)
2
(
x
−
2
)
=
2
(7)
2
(
x
＋
5
)
=
1
(8)
2
(
x
−
3
)
−
1
=
0
(9)
2
(
x
−
1
)
−
4
=
0
(10)
2
(
x
−
7
)
=
3
(11)
2
(
x
−
6
)
−
3
=
0
(12)
2
(
x
＋
7
)
=
49
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
7
)
=
1
x
＋
7
=
±
1
x
=
−
7
±
1
x
=
−6
，
−8
(2)
2
(
x
＋
9
)
=
7
x
＋
9
7
=
±
x
7
=
−
9
±
(3)
2
(
x
−
5
)
=
6
x
−
5
6
=
±
x
6
=
5
±
(4)
2
(
x
＋
1
)
=
1
x
＋
1
=
±
1
x
=
−
1
±
1
x
=
0
，
−2
(5)
2
(
x
−
5
)
=
64
x
−
5
=
±
8
x
=
5
±
8
x
=
13
，
−3
(6)
2
(
x
−
2
)
=
2
x
−
2
2
=
±
x
2
=
2
±
(7)
2
(
x
＋
5
)
=
1
x
＋
5
=
±
1
x
=
−
5
±
1
x
=
−4
，
−6
(8)
2
(
x
−
3
)
−
1
=
0
x
−
3
=
±
1
x
=
3
±
1
x
=
4
，
2
(9)
2
(
x
−
1
)
−
4
=
0
x
−
1
=
±
2
x
=
1
±
2
x
=
3
，
−1
(10)
2
(
x
−
7
)
=
3
x
−
7
3
=
±
x
3
=
7
±
(11)
2
(
x
−
6
)
−
3
=
0
x
−
6
3
=
±
x
3
=
6
±
(12)
2
(
x
＋
7
)
=
49
x
＋
7
=
±
7
x
=
−
7
±
7
x
=
0
，
−14