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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
)
=
4
(2)
2
(
x
−
1
)
=
81
(3)
2
(
x
＋
3
)
−
1
=
0
(4)
2
(
x
−
1
)
=
25
(5)
2
(
x
−
5
)
=
36
(6)
2
(
x
＋
6
)
=
16
(7)
2
(
x
＋
3
)
−
2
=
0
(8)
2
(
x
−
3
)
=
9
(9)
2
(
x
＋
5
)
−
7
=
0
(10)
2
(
x
−
1
)
=
9
(11)
2
(
x
−
6
)
=
36
(12)
2
(
x
−
7
)
−
1
=
0
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
7
)
=
4
x
＋
7
=
±
2
x
=
−
7
±
2
x
=
−5
，
−9
(2)
2
(
x
−
1
)
=
81
x
−
1
=
±
9
x
=
1
±
9
x
=
10
，
−8
(3)
2
(
x
＋
3
)
−
1
=
0
x
＋
3
=
±
1
x
=
−
3
±
1
x
=
−2
，
−4
(4)
2
(
x
−
1
)
=
25
x
−
1
=
±
5
x
=
1
±
5
x
=
6
，
−4
(5)
2
(
x
−
5
)
=
36
x
−
5
=
±
6
x
=
5
±
6
x
=
11
，
−1
(6)
2
(
x
＋
6
)
=
16
x
＋
6
=
±
4
x
=
−
6
±
4
x
=
−2
，
−10
(7)
2
(
x
＋
3
)
−
2
=
0
x
＋
3
2
=
±
x
2
=
−
3
±
(8)
2
(
x
−
3
)
=
9
x
−
3
=
±
3
x
=
3
±
3
x
=
6
，
0
(9)
2
(
x
＋
5
)
−
7
=
0
x
＋
5
7
=
±
x
7
=
−
5
±
(10)
2
(
x
−
1
)
=
9
x
−
1
=
±
3
x
=
1
±
3
x
=
4
，
−2
(11)
2
(
x
−
6
)
=
36
x
−
6
=
±
6
x
=
6
±
6
x
=
12
，
0
(12)
2
(
x
−
7
)
−
1
=
0
x
−
7
=
±
1
x
=
7
±
1
x
=
8
，
6