［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
＋
9
)
=
4
(2)
2
(
x
−
7
)
−
25
=
0
(3)
2
(
x
＋
9
)
−
7
=
0
(4)
2
(
x
＋
6
)
−
2
=
0
(5)
2
(
x
−
7
)
−
100
=
0
(6)
2
(
x
−
3
)
=
16
(7)
2
(
x
＋
6
)
−
6
=
0
(8)
2
(
x
＋
9
)
=
5
(9)
2
(
x
＋
5
)
−
5
=
0
(10)
2
(
x
−
7
)
−
1
=
0
(11)
2
(
x
＋
5
)
−
9
=
0
(12)
2
(
x
−
6
)
=
64
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
9
)
=
4
x
＋
9
=
±
2
x
=
−
9
±
2
x
=
−7
，
−11
(2)
2
(
x
−
7
)
−
25
=
0
x
−
7
=
±
5
x
=
7
±
5
x
=
12
，
2
(3)
2
(
x
＋
9
)
−
7
=
0
x
＋
9
7
=
±
x
7
=
−
9
±
(4)
2
(
x
＋
6
)
−
2
=
0
x
＋
6
2
=
±
x
2
=
−
6
±
(5)
2
(
x
−
7
)
−
100
=
0
x
−
7
=
±
10
x
=
7
±
10
x
=
17
，
−3
(6)
2
(
x
−
3
)
=
16
x
−
3
=
±
4
x
=
3
±
4
x
=
7
，
−1
(7)
2
(
x
＋
6
)
−
6
=
0
x
＋
6
6
=
±
x
6
=
−
6
±
(8)
2
(
x
＋
9
)
=
5
x
＋
9
5
=
±
x
5
=
−
9
±
(9)
2
(
x
＋
5
)
−
5
=
0
x
＋
5
5
=
±
x
5
=
−
5
±
(10)
2
(
x
−
7
)
−
1
=
0
x
−
7
=
±
1
x
=
7
±
1
x
=
8
，
6
(11)
2
(
x
＋
5
)
−
9
=
0
x
＋
5
=
±
3
x
=
−
5
±
3
x
=
−2
，
−8
(12)
2
(
x
−
6
)
=
64
x
−
6
=
±
8
x
=
6
±
8
x
=
14
，
−2