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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
＋
1
)
=
8
(2)
2
(
x
−
5
)
=
9
(3)
2
(
x
＋
10
)
=
1
(4)
2
(
x
−
5
)
=
36
(5)
2
(
x
＋
2
)
−
9
=
0
(6)
2
(
x
＋
2
)
=
6
(7)
2
(
x
＋
4
)
−
49
=
0
(8)
2
(
x
＋
8
)
=
1
(9)
2
(
x
＋
5
)
−
4
=
0
(10)
2
(
x
−
4
)
=
16
(11)
2
(
x
＋
2
)
−
9
=
0
(12)
2
(
x
＋
8
)
=
81
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
1
)
=
8
x
＋
1
2
=
±
2
x
2
=
−
1
±
2
(2)
2
(
x
−
5
)
=
9
x
−
5
=
±
3
x
=
5
±
3
x
=
8
，
2
(3)
2
(
x
＋
10
)
=
1
x
＋
10
=
±
1
x
=
−
10
±
1
x
=
−9
，
−11
(4)
2
(
x
−
5
)
=
36
x
−
5
=
±
6
x
=
5
±
6
x
=
11
，
−1
(5)
2
(
x
＋
2
)
−
9
=
0
x
＋
2
=
±
3
x
=
−
2
±
3
x
=
1
，
−5
(6)
2
(
x
＋
2
)
=
6
x
＋
2
6
=
±
x
6
=
−
2
±
(7)
2
(
x
＋
4
)
−
49
=
0
x
＋
4
=
±
7
x
=
−
4
±
7
x
=
3
，
−11
(8)
2
(
x
＋
8
)
=
1
x
＋
8
=
±
1
x
=
−
8
±
1
x
=
−7
，
−9
(9)
2
(
x
＋
5
)
−
4
=
0
x
＋
5
=
±
2
x
=
−
5
±
2
x
=
−3
，
−7
(10)
2
(
x
−
4
)
=
16
x
−
4
=
±
4
x
=
4
±
4
x
=
8
，
0
(11)
2
(
x
＋
2
)
−
9
=
0
x
＋
2
=
±
3
x
=
−
2
±
3
x
=
1
，
−5
(12)
2
(
x
＋
8
)
=
81
x
＋
8
=
±
9
x
=
−
8
±
9
x
=
1
，
−17