［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
＋
4
)
=
16
(2)
2
(
x
−
7
)
−
6
=
0
(3)
2
(
x
−
7
)
=
49
(4)
2
(
x
＋
9
)
−
6
=
0
(5)
2
(
x
＋
8
)
−
2
=
0
(6)
2
(
x
−
5
)
=
9
(7)
2
(
x
−
6
)
=
1
(8)
2
(
x
−
7
)
−
1
=
0
(9)
2
(
x
＋
8
)
−
4
=
0
(10)
2
(
x
−
3
)
−
16
=
0
(11)
2
(
x
−
2
)
−
36
=
0
(12)
2
(
x
＋
2
)
−
36
=
0
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
4
)
=
16
x
＋
4
=
±
4
x
=
−
4
±
4
x
=
0
，
−8
(2)
2
(
x
−
7
)
−
6
=
0
x
−
7
6
=
±
x
6
=
7
±
(3)
2
(
x
−
7
)
=
49
x
−
7
=
±
7
x
=
7
±
7
x
=
14
，
0
(4)
2
(
x
＋
9
)
−
6
=
0
x
＋
9
6
=
±
x
6
=
−
9
±
(5)
2
(
x
＋
8
)
−
2
=
0
x
＋
8
2
=
±
x
2
=
−
8
±
(6)
2
(
x
−
5
)
=
9
x
−
5
=
±
3
x
=
5
±
3
x
=
8
，
2
(7)
2
(
x
−
6
)
=
1
x
−
6
=
±
1
x
=
6
±
1
x
=
7
，
5
(8)
2
(
x
−
7
)
−
1
=
0
x
−
7
=
±
1
x
=
7
±
1
x
=
8
，
6
(9)
2
(
x
＋
8
)
−
4
=
0
x
＋
8
=
±
2
x
=
−
8
±
2
x
=
−6
，
−10
(10)
2
(
x
−
3
)
−
16
=
0
x
−
3
=
±
4
x
=
3
±
4
x
=
7
，
−1
(11)
2
(
x
−
2
)
−
36
=
0
x
−
2
=
±
6
x
=
2
±
6
x
=
8
，
−4
(12)
2
(
x
＋
2
)
−
36
=
0
x
＋
2
=
±
6
x
=
−
2
±
6
x
=
4
，
−8