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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
)
=
16
(2)
2
(
x
−
1
)
=
1
(3)
2
(
x
＋
7
)
−
49
=
0
(4)
2
(
x
−
1
)
=
7
(5)
2
(
x
−
1
)
=
25
(6)
2
(
x
＋
7
)
=
81
(7)
2
(
x
−
7
)
=
1
(8)
2
(
x
−
5
)
=
9
(9)
2
(
x
＋
1
)
−
49
=
0
(10)
2
(
x
−
2
)
=
2
(11)
2
(
x
＋
9
)
=
49
(12)
2
(
x
＋
4
)
=
49
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
9
)
=
16
x
＋
9
=
±
4
x
=
−
9
±
4
x
=
−5
，
−13
(2)
2
(
x
−
1
)
=
1
x
−
1
=
±
1
x
=
1
±
1
x
=
2
，
0
(3)
2
(
x
＋
7
)
−
49
=
0
x
＋
7
=
±
7
x
=
−
7
±
7
x
=
0
，
−14
(4)
2
(
x
−
1
)
=
7
x
−
1
7
=
±
x
7
=
1
±
(5)
2
(
x
−
1
)
=
25
x
−
1
=
±
5
x
=
1
±
5
x
=
6
，
−4
(6)
2
(
x
＋
7
)
=
81
x
＋
7
=
±
9
x
=
−
7
±
9
x
=
2
，
−16
(7)
2
(
x
−
7
)
=
1
x
−
7
=
±
1
x
=
7
±
1
x
=
8
，
6
(8)
2
(
x
−
5
)
=
9
x
−
5
=
±
3
x
=
5
±
3
x
=
8
，
2
(9)
2
(
x
＋
1
)
−
49
=
0
x
＋
1
=
±
7
x
=
−
1
±
7
x
=
6
，
−8
(10)
2
(
x
−
2
)
=
2
x
−
2
2
=
±
x
2
=
2
±
(11)
2
(
x
＋
9
)
=
49
x
＋
9
=
±
7
x
=
−
9
±
7
x
=
−2
，
−16
(12)
2
(
x
＋
4
)
=
49
x
＋
4
=
±
7
x
=
−
4
±
7
x
=
3
，
−11