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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
＋
5
)
=
49
(2)
2
(
x
＋
3
)
−
25
=
0
(3)
2
(
x
＋
5
)
=
64
(4)
2
(
x
＋
2
)
=
9
(5)
2
(
x
＋
5
)
−
4
=
0
(6)
2
(
x
＋
1
)
=
4
(7)
2
(
x
−
6
)
=
6
(8)
2
(
x
−
1
)
−
8
=
0
(9)
2
(
x
＋
5
)
=
2
(10)
2
(
x
＋
1
)
−
16
=
0
(11)
2
(
x
−
3
)
−
81
=
0
(12)
2
(
x
−
2
)
−
1
=
0
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
5
)
=
49
x
＋
5
=
±
7
x
=
−
5
±
7
x
=
2
，
−12
(2)
2
(
x
＋
3
)
−
25
=
0
x
＋
3
=
±
5
x
=
−
3
±
5
x
=
2
，
−8
(3)
2
(
x
＋
5
)
=
64
x
＋
5
=
±
8
x
=
−
5
±
8
x
=
3
，
−13
(4)
2
(
x
＋
2
)
=
9
x
＋
2
=
±
3
x
=
−
2
±
3
x
=
1
，
−5
(5)
2
(
x
＋
5
)
−
4
=
0
x
＋
5
=
±
2
x
=
−
5
±
2
x
=
−3
，
−7
(6)
2
(
x
＋
1
)
=
4
x
＋
1
=
±
2
x
=
−
1
±
2
x
=
1
，
−3
(7)
2
(
x
−
6
)
=
6
x
−
6
6
=
±
x
6
=
6
±
(8)
2
(
x
−
1
)
−
8
=
0
x
−
1
2
=
±
2
x
2
=
1
±
2
(9)
2
(
x
＋
5
)
=
2
x
＋
5
2
=
±
x
2
=
−
5
±
(10)
2
(
x
＋
1
)
−
16
=
0
x
＋
1
=
±
4
x
=
−
1
±
4
x
=
3
，
−5
(11)
2
(
x
−
3
)
−
81
=
0
x
−
3
=
±
9
x
=
3
±
9
x
=
12
，
−6
(12)
2
(
x
−
2
)
−
1
=
0
x
−
2
=
±
1
x
=
2
±
1
x
=
3
，
1