［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
)
=
25
(2)
2
(
x
＋
4
)
=
64
(3)
2
(
x
−
7
)
=
64
(4)
2
(
x
＋
2
)
=
10
(5)
2
(
x
−
2
)
=
81
(6)
2
(
x
−
5
)
=
4
(7)
2
(
x
−
2
)
=
49
(8)
2
(
x
−
5
)
=
81
(9)
2
(
x
−
3
)
=
4
(10)
2
(
x
＋
4
)
=
10
(11)
2
(
x
＋
5
)
=
36
(12)
2
(
x
−
2
)
=
81
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
7
)
=
25
x
＋
7
=
±
5
x
=
−
7
±
5
x
=
−2
，
−12
(2)
2
(
x
＋
4
)
=
64
x
＋
4
=
±
8
x
=
−
4
±
8
x
=
4
，
−12
(3)
2
(
x
−
7
)
=
64
x
−
7
=
±
8
x
=
7
±
8
x
=
15
，
−1
(4)
2
(
x
＋
2
)
=
10
x
＋
2
10
=
±
x
10
=
−
2
±
(5)
2
(
x
−
2
)
=
81
x
−
2
=
±
9
x
=
2
±
9
x
=
11
，
−7
(6)
2
(
x
−
5
)
=
4
x
−
5
=
±
2
x
=
5
±
2
x
=
7
，
3
(7)
2
(
x
−
2
)
=
49
x
−
2
=
±
7
x
=
2
±
7
x
=
9
，
−5
(8)
2
(
x
−
5
)
=
81
x
−
5
=
±
9
x
=
5
±
9
x
=
14
，
−4
(9)
2
(
x
−
3
)
=
4
x
−
3
=
±
2
x
=
3
±
2
x
=
5
，
1
(10)
2
(
x
＋
4
)
=
10
x
＋
4
10
=
±
x
10
=
−
4
±
(11)
2
(
x
＋
5
)
=
36
x
＋
5
=
±
6
x
=
−
5
±
6
x
=
1
，
−11
(12)
2
(
x
−
2
)
=
81
x
−
2
=
±
9
x
=
2
±
9
x
=
11
，
−7