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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
)
=
1
(2)
2
(
x
−
7
)
=
9
(3)
2
(
x
＋
8
)
=
5
(4)
2
(
x
−
6
)
=
100
(5)
2
(
x
−
5
)
=
36
(6)
2
(
x
＋
2
)
=
81
(7)
2
(
x
＋
10
)
=
9
(8)
2
(
x
＋
5
)
=
7
(9)
2
(
x
＋
2
)
−
1
=
0
(10)
2
(
x
−
1
)
=
7
(11)
2
(
x
−
2
)
=
9
(12)
2
(
x
−
1
)
=
36
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
7
)
=
1
x
＋
7
=
±
1
x
=
−
7
±
1
x
=
−6
，
−8
(2)
2
(
x
−
7
)
=
9
x
−
7
=
±
3
x
=
7
±
3
x
=
10
，
4
(3)
2
(
x
＋
8
)
=
5
x
＋
8
5
=
±
x
5
=
−
8
±
(4)
2
(
x
−
6
)
=
100
x
−
6
=
±
10
x
=
6
±
10
x
=
16
，
−4
(5)
2
(
x
−
5
)
=
36
x
−
5
=
±
6
x
=
5
±
6
x
=
11
，
−1
(6)
2
(
x
＋
2
)
=
81
x
＋
2
=
±
9
x
=
−
2
±
9
x
=
7
，
−11
(7)
2
(
x
＋
10
)
=
9
x
＋
10
=
±
3
x
=
−
10
±
3
x
=
−7
，
−13
(8)
2
(
x
＋
5
)
=
7
x
＋
5
7
=
±
x
7
=
−
5
±
(9)
2
(
x
＋
2
)
−
1
=
0
x
＋
2
=
±
1
x
=
−
2
±
1
x
=
−1
，
−3
(10)
2
(
x
−
1
)
=
7
x
−
1
7
=
±
x
7
=
1
±
(11)
2
(
x
−
2
)
=
9
x
−
2
=
±
3
x
=
2
±
3
x
=
5
，
−1
(12)
2
(
x
−
1
)
=
36
x
−
1
=
±
6
x
=
1
±
6
x
=
7
，
−5