［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
[211-20]
(1)
2
16
(
x
−
1
)
=
9
(2)
6
2
25
(
x
＋
)
=
5
16
(3)
1
2
(
x
＋
)
=
1
7
(4)
2
9
(
x
−
1
)
=
25
(5)
2
2
(
x
−
)
=
1
3
(6)
2
(
x
＋
1
)
=
1
(7)
4
2
(
x
−
)
=
1
7
(8)
2
5
(
x
−
1
)
−
=
0
7
(9)
1
2
9
(
x
−
)
−
=
0
2
4
(10)
2
4
(
x
−
1
)
−
=
0
7
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
−
1
)
16
=
9
x
−
1
4
=
±
3
x
4
=
1
±
3
x
7
1
=
，
−
3
3
(2)
6
2
(
x
＋
)
5
25
=
16
6
x
＋
5
5
=
±
4
x
6
5
=
−
±
5
4
x
1
49
=
，
−
20
20
(3)
1
2
(
x
＋
)
7
=
1
1
x
＋
7
=
±
1
x
1
=
−
±
1
7
x
6
8
=
，
−
7
7
(4)
2
(
x
−
1
)
9
=
25
x
−
1
3
=
±
5
x
3
=
1
±
5
x
8
2
=
，
5
5
(5)
2
2
(
x
−
)
3
=
1
2
x
−
3
=
±
1
x
2
=
±
1
3
x
5
1
=
，
−
3
3
(6)
2
(
x
＋
1
)
=
1
x
＋
1
=
±
1
x
=
−
1
±
1
x
=
0
，
−2
(7)
4
2
(
x
−
)
7
=
1
4
x
−
7
=
±
1
x
4
=
±
1
7
x
11
3
=
，
−
7
7
(8)
2
5
(
x
−
1
)
−
7
=
0
x
−
1
35
=
±
7
x
35
=
1
±
7
(9)
1
2
9
(
x
−
)
−
2
4
=
0
1
x
−
2
3
=
±
2
x
1
3
=
±
2
2
x
=
2
，
−1
(10)
2
4
(
x
−
1
)
−
7
=
0
x
−
1
2
7
=
±
7
x
2
7
=
1
±
7