［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
＋
1
)
−
9
=
0
(2)
2
(
x
＋
1
)
=
4
(3)
2
(
x
＋
3
)
−
4
=
0
(4)
2
(
x
−
6
)
=
81
(5)
2
(
x
−
4
)
=
25
(6)
2
(
x
＋
7
)
=
6
(7)
2
(
x
＋
8
)
=
9
(8)
2
(
x
−
1
)
−
1
=
0
(9)
2
(
x
−
6
)
=
2
(10)
2
(
x
＋
2
)
−
7
=
0
(11)
2
(
x
−
3
)
=
4
(12)
2
(
x
−
5
)
−
49
=
0
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
1
)
−
9
=
0
x
＋
1
=
±
3
x
=
−
1
±
3
x
=
2
，
−4
(2)
2
(
x
＋
1
)
=
4
x
＋
1
=
±
2
x
=
−
1
±
2
x
=
1
，
−3
(3)
2
(
x
＋
3
)
−
4
=
0
x
＋
3
=
±
2
x
=
−
3
±
2
x
=
−1
，
−5
(4)
2
(
x
−
6
)
=
81
x
−
6
=
±
9
x
=
6
±
9
x
=
15
，
−3
(5)
2
(
x
−
4
)
=
25
x
−
4
=
±
5
x
=
4
±
5
x
=
9
，
−1
(6)
2
(
x
＋
7
)
=
6
x
＋
7
6
=
±
x
6
=
−
7
±
(7)
2
(
x
＋
8
)
=
9
x
＋
8
=
±
3
x
=
−
8
±
3
x
=
−5
，
−11
(8)
2
(
x
−
1
)
−
1
=
0
x
−
1
=
±
1
x
=
1
±
1
x
=
2
，
0
(9)
2
(
x
−
6
)
=
2
x
−
6
2
=
±
x
2
=
6
±
(10)
2
(
x
＋
2
)
−
7
=
0
x
＋
2
7
=
±
x
7
=
−
2
±
(11)
2
(
x
−
3
)
=
4
x
−
3
=
±
2
x
=
3
±
2
x
=
5
，
1
(12)
2
(
x
−
5
)
−
49
=
0
x
−
5
=
±
7
x
=
5
±
7
x
=
12
，
−2