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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
)
=
5
(2)
2
(
x
＋
2
)
−
64
=
0
(3)
2
(
x
＋
5
)
−
9
=
0
(4)
2
(
x
＋
2
)
=
8
(5)
2
(
x
−
1
)
−
64
=
0
(6)
2
(
x
＋
3
)
=
1
(7)
2
(
x
＋
1
)
=
49
(8)
2
(
x
−
3
)
=
1
(9)
2
(
x
＋
9
)
=
1
(10)
2
(
x
＋
4
)
=
8
(11)
2
(
x
−
6
)
=
81
(12)
2
(
x
−
4
)
=
4
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
4
)
=
5
x
＋
4
5
=
±
x
5
=
−
4
±
(2)
2
(
x
＋
2
)
−
64
=
0
x
＋
2
=
±
8
x
=
−
2
±
8
x
=
6
，
−10
(3)
2
(
x
＋
5
)
−
9
=
0
x
＋
5
=
±
3
x
=
−
5
±
3
x
=
−2
，
−8
(4)
2
(
x
＋
2
)
=
8
x
＋
2
2
=
±
2
x
2
=
−
2
±
2
(5)
2
(
x
−
1
)
−
64
=
0
x
−
1
=
±
8
x
=
1
±
8
x
=
9
，
−7
(6)
2
(
x
＋
3
)
=
1
x
＋
3
=
±
1
x
=
−
3
±
1
x
=
−2
，
−4
(7)
2
(
x
＋
1
)
=
49
x
＋
1
=
±
7
x
=
−
1
±
7
x
=
6
，
−8
(8)
2
(
x
−
3
)
=
1
x
−
3
=
±
1
x
=
3
±
1
x
=
4
，
2
(9)
2
(
x
＋
9
)
=
1
x
＋
9
=
±
1
x
=
−
9
±
1
x
=
−8
，
−10
(10)
2
(
x
＋
4
)
=
8
x
＋
4
2
=
±
2
x
2
=
−
4
±
2
(11)
2
(
x
−
6
)
=
81
x
−
6
=
±
9
x
=
6
±
9
x
=
15
，
−3
(12)
2
(
x
−
4
)
=
4
x
−
4
=
±
2
x
=
4
±
2
x
=
6
，
2