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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
(2)
2
(
x
−
5
)
=
4
(3)
2
(
x
＋
8
)
=
16
(4)
2
(
x
−
4
)
=
4
(5)
2
(
x
＋
5
)
=
5
(6)
2
(
x
＋
6
)
−
1
=
0
(7)
2
(
x
−
3
)
=
25
(8)
2
(
x
−
1
)
−
7
=
0
(9)
2
(
x
＋
3
)
=
25
(10)
2
(
x
＋
5
)
=
6
(11)
2
(
x
＋
6
)
=
81
(12)
2
(
x
＋
3
)
=
1
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
3
)
=
8
x
＋
3
2
=
±
2
x
2
=
−
3
±
2
(2)
2
(
x
−
5
)
=
4
x
−
5
=
±
2
x
=
5
±
2
x
=
7
，
3
(3)
2
(
x
＋
8
)
=
16
x
＋
8
=
±
4
x
=
−
8
±
4
x
=
−4
，
−12
(4)
2
(
x
−
4
)
=
4
x
−
4
=
±
2
x
=
4
±
2
x
=
6
，
2
(5)
2
(
x
＋
5
)
=
5
x
＋
5
5
=
±
x
5
=
−
5
±
(6)
2
(
x
＋
6
)
−
1
=
0
x
＋
6
=
±
1
x
=
−
6
±
1
x
=
−5
，
−7
(7)
2
(
x
−
3
)
=
25
x
−
3
=
±
5
x
=
3
±
5
x
=
8
，
−2
(8)
2
(
x
−
1
)
−
7
=
0
x
−
1
7
=
±
x
7
=
1
±
(9)
2
(
x
＋
3
)
=
25
x
＋
3
=
±
5
x
=
−
3
±
5
x
=
2
，
−8
(10)
2
(
x
＋
5
)
=
6
x
＋
5
6
=
±
x
6
=
−
5
±
(11)
2
(
x
＋
6
)
=
81
x
＋
6
=
±
9
x
=
−
6
±
9
x
=
3
，
−15
(12)
2
(
x
＋
3
)
=
1
x
＋
3
=
±
1
x
=
−
3
±
1
x
=
−2
，
−4