［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
)
=
5
(2)
2
(
x
−
3
)
=
25
(3)
2
(
x
＋
10
)
=
25
(4)
2
(
x
−
1
)
=
7
(5)
2
(
x
−
5
)
−
9
=
0
(6)
2
(
x
＋
2
)
=
9
(7)
2
(
x
−
3
)
=
8
(8)
2
(
x
＋
9
)
=
64
(9)
2
(
x
−
6
)
=
36
(10)
2
(
x
＋
1
)
=
49
(11)
2
(
x
＋
8
)
−
8
=
0
(12)
2
(
x
−
2
)
=
4
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
7
)
=
5
x
＋
7
5
=
±
x
5
=
−
7
±
(2)
2
(
x
−
3
)
=
25
x
−
3
=
±
5
x
=
3
±
5
x
=
8
，
−2
(3)
2
(
x
＋
10
)
=
25
x
＋
10
=
±
5
x
=
−
10
±
5
x
=
−5
，
−15
(4)
2
(
x
−
1
)
=
7
x
−
1
7
=
±
x
7
=
1
±
(5)
2
(
x
−
5
)
−
9
=
0
x
−
5
=
±
3
x
=
5
±
3
x
=
8
，
2
(6)
2
(
x
＋
2
)
=
9
x
＋
2
=
±
3
x
=
−
2
±
3
x
=
1
，
−5
(7)
2
(
x
−
3
)
=
8
x
−
3
2
=
±
2
x
2
=
3
±
2
(8)
2
(
x
＋
9
)
=
64
x
＋
9
=
±
8
x
=
−
9
±
8
x
=
−1
，
−17
(9)
2
(
x
−
6
)
=
36
x
−
6
=
±
6
x
=
6
±
6
x
=
12
，
0
(10)
2
(
x
＋
1
)
=
49
x
＋
1
=
±
7
x
=
−
1
±
7
x
=
6
，
−8
(11)
2
(
x
＋
8
)
−
8
=
0
x
＋
8
2
=
±
2
x
2
=
−
8
±
2
(12)
2
(
x
−
2
)
=
4
x
−
2
=
±
2
x
=
2
±
2
x
=
4
，
0