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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
＋
7
)
=
49
(2)
2
(
x
−
5
)
=
1
(3)
2
(
x
＋
2
)
=
7
(4)
2
(
x
−
6
)
=
49
(5)
2
(
x
＋
3
)
−
1
=
0
(6)
2
(
x
＋
7
)
=
7
(7)
2
(
x
−
5
)
=
64
(8)
2
(
x
−
3
)
−
64
=
0
(9)
2
(
x
＋
1
)
=
6
(10)
2
(
x
＋
3
)
=
64
(11)
2
(
x
−
5
)
=
6
(12)
2
(
x
−
1
)
−
25
=
0
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
7
)
=
49
x
＋
7
=
±
7
x
=
−
7
±
7
x
=
0
，
−14
(2)
2
(
x
−
5
)
=
1
x
−
5
=
±
1
x
=
5
±
1
x
=
6
，
4
(3)
2
(
x
＋
2
)
=
7
x
＋
2
7
=
±
x
7
=
−
2
±
(4)
2
(
x
−
6
)
=
49
x
−
6
=
±
7
x
=
6
±
7
x
=
13
，
−1
(5)
2
(
x
＋
3
)
−
1
=
0
x
＋
3
=
±
1
x
=
−
3
±
1
x
=
−2
，
−4
(6)
2
(
x
＋
7
)
=
7
x
＋
7
7
=
±
x
7
=
−
7
±
(7)
2
(
x
−
5
)
=
64
x
−
5
=
±
8
x
=
5
±
8
x
=
13
，
−3
(8)
2
(
x
−
3
)
−
64
=
0
x
−
3
=
±
8
x
=
3
±
8
x
=
11
，
−5
(9)
2
(
x
＋
1
)
=
6
x
＋
1
6
=
±
x
6
=
−
1
±
(10)
2
(
x
＋
3
)
=
64
x
＋
3
=
±
8
x
=
−
3
±
8
x
=
5
，
−11
(11)
2
(
x
−
5
)
=
6
x
−
5
6
=
±
x
6
=
5
±
(12)
2
(
x
−
1
)
−
25
=
0
x
−
1
=
±
5
x
=
1
±
5
x
=
6
，
−4