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