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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
＋
9
)
−
81
=
0
(2)
2
(
x
＋
4
)
=
16
(3)
2
(
x
＋
2
)
=
64
(4)
2
(
x
−
5
)
=
16
(5)
2
(
x
−
6
)
=
4
(6)
2
(
x
＋
3
)
=
2
(7)
2
(
x
−
6
)
−
9
=
0
(8)
2
(
x
＋
4
)
=
5
(9)
2
(
x
−
2
)
−
49
=
0
(10)
2
(
x
−
6
)
−
4
=
0
(11)
2
(
x
−
4
)
−
49
=
0
(12)
2
(
x
＋
10
)
=
16
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
9
)
−
81
=
0
x
＋
9
=
±
9
x
=
−
9
±
9
x
=
0
，
−18
(2)
2
(
x
＋
4
)
=
16
x
＋
4
=
±
4
x
=
−
4
±
4
x
=
0
，
−8
(3)
2
(
x
＋
2
)
=
64
x
＋
2
=
±
8
x
=
−
2
±
8
x
=
6
，
−10
(4)
2
(
x
−
5
)
=
16
x
−
5
=
±
4
x
=
5
±
4
x
=
9
，
1
(5)
2
(
x
−
6
)
=
4
x
−
6
=
±
2
x
=
6
±
2
x
=
8
，
4
(6)
2
(
x
＋
3
)
=
2
x
＋
3
2
=
±
x
2
=
−
3
±
(7)
2
(
x
−
6
)
−
9
=
0
x
−
6
=
±
3
x
=
6
±
3
x
=
9
，
3
(8)
2
(
x
＋
4
)
=
5
x
＋
4
5
=
±
x
5
=
−
4
±
(9)
2
(
x
−
2
)
−
49
=
0
x
−
2
=
±
7
x
=
2
±
7
x
=
9
，
−5
(10)
2
(
x
−
6
)
−
4
=
0
x
−
6
=
±
2
x
=
6
±
2
x
=
8
，
4
(11)
2
(
x
−
4
)
−
49
=
0
x
−
4
=
±
7
x
=
4
±
7
x
=
11
，
−3
(12)
2
(
x
＋
10
)
=
16
x
＋
10
=
±
4
x
=
−
10
±
4
x
=
−6
，
−14