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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
−
4
)
=
9
(2)
2
(
x
＋
6
)
=
3
(3)
2
(
x
＋
8
)
=
49
(4)
2
(
x
＋
5
)
=
64
(5)
2
(
x
−
7
)
−
1
=
0
(6)
2
(
x
＋
6
)
=
64
(7)
2
(
x
＋
5
)
=
5
(8)
2
(
x
＋
5
)
=
3
(9)
2
(
x
−
2
)
−
4
=
0
(10)
2
(
x
＋
8
)
=
7
(11)
2
(
x
−
6
)
−
10
=
0
(12)
2
(
x
＋
7
)
−
100
=
0
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
−
4
)
=
9
x
−
4
=
±
3
x
=
4
±
3
x
=
7
，
1
(2)
2
(
x
＋
6
)
=
3
x
＋
6
3
=
±
x
3
=
−
6
±
(3)
2
(
x
＋
8
)
=
49
x
＋
8
=
±
7
x
=
−
8
±
7
x
=
−1
，
−15
(4)
2
(
x
＋
5
)
=
64
x
＋
5
=
±
8
x
=
−
5
±
8
x
=
3
，
−13
(5)
2
(
x
−
7
)
−
1
=
0
x
−
7
=
±
1
x
=
7
±
1
x
=
8
，
6
(6)
2
(
x
＋
6
)
=
64
x
＋
6
=
±
8
x
=
−
6
±
8
x
=
2
，
−14
(7)
2
(
x
＋
5
)
=
5
x
＋
5
5
=
±
x
5
=
−
5
±
(8)
2
(
x
＋
5
)
=
3
x
＋
5
3
=
±
x
3
=
−
5
±
(9)
2
(
x
−
2
)
−
4
=
0
x
−
2
=
±
2
x
=
2
±
2
x
=
4
，
0
(10)
2
(
x
＋
8
)
=
7
x
＋
8
7
=
±
x
7
=
−
8
±
(11)
2
(
x
−
6
)
−
10
=
0
x
−
6
10
=
±
x
10
=
6
±
(12)
2
(
x
＋
7
)
−
100
=
0
x
＋
7
=
±
10
x
=
−
7
±
10
x
=
3
，
−17