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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
＋
9
)
−
25
=
0
(2)
2
(
x
＋
1
)
−
3
=
0
(3)
2
(
x
−
1
)
=
7
(4)
2
(
x
＋
5
)
=
36
(5)
2
(
x
−
1
)
=
1
(6)
2
(
x
＋
8
)
−
16
=
0
(7)
2
(
x
−
4
)
=
4
(8)
2
(
x
＋
9
)
=
1
(9)
2
(
x
−
3
)
=
4
(10)
2
(
x
−
3
)
=
1
(11)
2
(
x
−
2
)
=
1
(12)
2
(
x
＋
1
)
=
1
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
9
)
−
25
=
0
x
＋
9
=
±
5
x
=
−
9
±
5
x
=
−4
，
−14
(2)
2
(
x
＋
1
)
−
3
=
0
x
＋
1
3
=
±
x
3
=
−
1
±
(3)
2
(
x
−
1
)
=
7
x
−
1
7
=
±
x
7
=
1
±
(4)
2
(
x
＋
5
)
=
36
x
＋
5
=
±
6
x
=
−
5
±
6
x
=
1
，
−11
(5)
2
(
x
−
1
)
=
1
x
−
1
=
±
1
x
=
1
±
1
x
=
2
，
0
(6)
2
(
x
＋
8
)
−
16
=
0
x
＋
8
=
±
4
x
=
−
8
±
4
x
=
−4
，
−12
(7)
2
(
x
−
4
)
=
4
x
−
4
=
±
2
x
=
4
±
2
x
=
6
，
2
(8)
2
(
x
＋
9
)
=
1
x
＋
9
=
±
1
x
=
−
9
±
1
x
=
−8
，
−10
(9)
2
(
x
−
3
)
=
4
x
−
3
=
±
2
x
=
3
±
2
x
=
5
，
1
(10)
2
(
x
−
3
)
=
1
x
−
3
=
±
1
x
=
3
±
1
x
=
4
，
2
(11)
2
(
x
−
2
)
=
1
x
−
2
=
±
1
x
=
2
±
1
x
=
3
，
1
(12)
2
(
x
＋
1
)
=
1
x
＋
1
=
±
1
x
=
−
1
±
1
x
=
0
，
−2