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©2025 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
)
=
3
(3)
2
(
x
−
7
)
=
25
(4)
2
(
x
−
1
)
=
16
(5)
2
(
x
＋
6
)
=
25
(6)
2
(
x
−
4
)
−
4
=
0
(7)
2
(
x
＋
7
)
=
64
(8)
2
(
x
＋
7
)
=
3
(9)
2
(
x
−
5
)
=
49
(10)
2
(
x
−
3
)
=
4
(11)
2
(
x
−
7
)
=
6
(12)
2
(
x
−
4
)
=
16
©2025 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
)
=
3
x
−
6
3
=
±
x
3
=
6
±
(3)
2
(
x
−
7
)
=
25
x
−
7
=
±
5
x
=
7
±
5
x
=
12
，
2
(4)
2
(
x
−
1
)
=
16
x
−
1
=
±
4
x
=
1
±
4
x
=
5
，
−3
(5)
2
(
x
＋
6
)
=
25
x
＋
6
=
±
5
x
=
−
6
±
5
x
=
−1
，
−11
(6)
2
(
x
−
4
)
−
4
=
0
x
−
4
=
±
2
x
=
4
±
2
x
=
6
，
2
(7)
2
(
x
＋
7
)
=
64
x
＋
7
=
±
8
x
=
−
7
±
8
x
=
1
，
−15
(8)
2
(
x
＋
7
)
=
3
x
＋
7
3
=
±
x
3
=
−
7
±
(9)
2
(
x
−
5
)
=
49
x
−
5
=
±
7
x
=
5
±
7
x
=
12
，
−2
(10)
2
(
x
−
3
)
=
4
x
−
3
=
±
2
x
=
3
±
2
x
=
5
，
1
(11)
2
(
x
−
7
)
=
6
x
−
7
6
=
±
x
6
=
7
±
(12)
2
(
x
−
4
)
=
16
x
−
4
=
±
4
x
=
4
±
4
x
=
8
，
0