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©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
)
=
25
(2)
2
(
x
−
6
)
=
81
(3)
2
(
x
−
6
)
=
16
(4)
2
(
x
−
3
)
−
2
=
0
(5)
2
(
x
＋
10
)
=
9
(6)
2
(
x
＋
3
)
−
7
=
0
(7)
2
(
x
＋
5
)
−
25
=
0
(8)
2
(
x
＋
7
)
=
10
(9)
2
(
x
−
5
)
=
1
(10)
2
(
x
＋
1
)
−
6
=
0
(11)
2
(
x
＋
7
)
=
36
(12)
2
(
x
＋
9
)
=
7
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
2
)
=
25
x
＋
2
=
±
5
x
=
−
2
±
5
x
=
3
，
−7
(2)
2
(
x
−
6
)
=
81
x
−
6
=
±
9
x
=
6
±
9
x
=
15
，
−3
(3)
2
(
x
−
6
)
=
16
x
−
6
=
±
4
x
=
6
±
4
x
=
10
，
2
(4)
2
(
x
−
3
)
−
2
=
0
x
−
3
2
=
±
x
2
=
3
±
(5)
2
(
x
＋
10
)
=
9
x
＋
10
=
±
3
x
=
−
10
±
3
x
=
−7
，
−13
(6)
2
(
x
＋
3
)
−
7
=
0
x
＋
3
7
=
±
x
7
=
−
3
±
(7)
2
(
x
＋
5
)
−
25
=
0
x
＋
5
=
±
5
x
=
−
5
±
5
x
=
0
，
−10
(8)
2
(
x
＋
7
)
=
10
x
＋
7
10
=
±
x
10
=
−
7
±
(9)
2
(
x
−
5
)
=
1
x
−
5
=
±
1
x
=
5
±
1
x
=
6
，
4
(10)
2
(
x
＋
1
)
−
6
=
0
x
＋
1
6
=
±
x
6
=
−
1
±
(11)
2
(
x
＋
7
)
=
36
x
＋
7
=
±
6
x
=
−
7
±
6
x
=
−1
，
−13
(12)
2
(
x
＋
9
)
=
7
x
＋
9
7
=
±
x
7
=
−
9
±