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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
)
=
64
(2)
2
(
x
−
7
)
=
8
(3)
2
(
x
＋
9
)
=
1
(4)
2
(
x
−
2
)
=
16
(5)
2
(
x
＋
8
)
−
8
=
0
(6)
2
(
x
＋
1
)
=
81
(7)
2
(
x
−
1
)
−
4
=
0
(8)
2
(
x
−
5
)
−
3
=
0
(9)
2
(
x
−
2
)
=
9
(10)
2
(
x
＋
1
)
−
4
=
0
(11)
2
(
x
＋
6
)
−
5
=
0
(12)
2
(
x
＋
3
)
=
81
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
7
)
=
64
x
＋
7
=
±
8
x
=
−
7
±
8
x
=
1
，
−15
(2)
2
(
x
−
7
)
=
8
x
−
7
2
=
±
2
x
2
=
7
±
2
(3)
2
(
x
＋
9
)
=
1
x
＋
9
=
±
1
x
=
−
9
±
1
x
=
−8
，
−10
(4)
2
(
x
−
2
)
=
16
x
−
2
=
±
4
x
=
2
±
4
x
=
6
，
−2
(5)
2
(
x
＋
8
)
−
8
=
0
x
＋
8
2
=
±
2
x
2
=
−
8
±
2
(6)
2
(
x
＋
1
)
=
81
x
＋
1
=
±
9
x
=
−
1
±
9
x
=
8
，
−10
(7)
2
(
x
−
1
)
−
4
=
0
x
−
1
=
±
2
x
=
1
±
2
x
=
3
，
−1
(8)
2
(
x
−
5
)
−
3
=
0
x
−
5
3
=
±
x
3
=
5
±
(9)
2
(
x
−
2
)
=
9
x
−
2
=
±
3
x
=
2
±
3
x
=
5
，
−1
(10)
2
(
x
＋
1
)
−
4
=
0
x
＋
1
=
±
2
x
=
−
1
±
2
x
=
1
，
−3
(11)
2
(
x
＋
6
)
−
5
=
0
x
＋
6
5
=
±
x
5
=
−
6
±
(12)
2
(
x
＋
3
)
=
81
x
＋
3
=
±
9
x
=
−
3
±
9
x
=
6
，
−12