［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
＋
2
)
=
2
(2)
2
(
x
−
2
)
=
9
(3)
2
(
x
−
7
)
=
25
(4)
2
(
x
＋
1
)
=
25
(5)
2
(
x
−
2
)
=
100
(6)
2
(
x
−
6
)
=
9
(7)
2
(
x
＋
4
)
=
1
(8)
2
(
x
＋
7
)
−
2
=
0
(9)
2
(
x
＋
4
)
=
16
(10)
2
(
x
＋
7
)
=
9
(11)
2
(
x
＋
9
)
=
2
(12)
2
(
x
＋
10
)
−
100
=
0
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
2
)
=
2
x
＋
2
2
=
±
x
2
=
−
2
±
(2)
2
(
x
−
2
)
=
9
x
−
2
=
±
3
x
=
2
±
3
x
=
5
，
−1
(3)
2
(
x
−
7
)
=
25
x
−
7
=
±
5
x
=
7
±
5
x
=
12
，
2
(4)
2
(
x
＋
1
)
=
25
x
＋
1
=
±
5
x
=
−
1
±
5
x
=
4
，
−6
(5)
2
(
x
−
2
)
=
100
x
−
2
=
±
10
x
=
2
±
10
x
=
12
，
−8
(6)
2
(
x
−
6
)
=
9
x
−
6
=
±
3
x
=
6
±
3
x
=
9
，
3
(7)
2
(
x
＋
4
)
=
1
x
＋
4
=
±
1
x
=
−
4
±
1
x
=
−3
，
−5
(8)
2
(
x
＋
7
)
−
2
=
0
x
＋
7
2
=
±
x
2
=
−
7
±
(9)
2
(
x
＋
4
)
=
16
x
＋
4
=
±
4
x
=
−
4
±
4
x
=
0
，
−8
(10)
2
(
x
＋
7
)
=
9
x
＋
7
=
±
3
x
=
−
7
±
3
x
=
−4
，
−10
(11)
2
(
x
＋
9
)
=
2
x
＋
9
2
=
±
x
2
=
−
9
±
(12)
2
(
x
＋
10
)
−
100
=
0
x
＋
10
=
±
10
x
=
−
10
±
10
x
=
0
，
−20