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©2025 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
)
−
9
=
0
(2)
2
(
x
＋
3
)
=
25
(3)
2
(
x
−
4
)
−
64
=
0
(4)
2
(
x
＋
9
)
=
5
(5)
2
(
x
＋
1
)
=
1
(6)
2
(
x
＋
6
)
−
2
=
0
(7)
2
(
x
＋
8
)
−
16
=
0
(8)
2
(
x
＋
9
)
=
5
(9)
2
(
x
＋
5
)
−
1
=
0
(10)
2
(
x
＋
7
)
−
49
=
0
(11)
2
(
x
＋
1
)
−
49
=
0
(12)
2
(
x
−
1
)
=
3
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
9
)
−
9
=
0
x
＋
9
=
±
3
x
=
−
9
±
3
x
=
−6
，
−12
(2)
2
(
x
＋
3
)
=
25
x
＋
3
=
±
5
x
=
−
3
±
5
x
=
2
，
−8
(3)
2
(
x
−
4
)
−
64
=
0
x
−
4
=
±
8
x
=
4
±
8
x
=
12
，
−4
(4)
2
(
x
＋
9
)
=
5
x
＋
9
5
=
±
x
5
=
−
9
±
(5)
2
(
x
＋
1
)
=
1
x
＋
1
=
±
1
x
=
−
1
±
1
x
=
0
，
−2
(6)
2
(
x
＋
6
)
−
2
=
0
x
＋
6
2
=
±
x
2
=
−
6
±
(7)
2
(
x
＋
8
)
−
16
=
0
x
＋
8
=
±
4
x
=
−
8
±
4
x
=
−4
，
−12
(8)
2
(
x
＋
9
)
=
5
x
＋
9
5
=
±
x
5
=
−
9
±
(9)
2
(
x
＋
5
)
−
1
=
0
x
＋
5
=
±
1
x
=
−
5
±
1
x
=
−4
，
−6
(10)
2
(
x
＋
7
)
−
49
=
0
x
＋
7
=
±
7
x
=
−
7
±
7
x
=
0
，
−14
(11)
2
(
x
＋
1
)
−
49
=
0
x
＋
1
=
±
7
x
=
−
1
±
7
x
=
6
，
−8
(12)
2
(
x
−
1
)
=
3
x
−
1
3
=
±
x
3
=
1
±