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