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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
＋
5
)
−
9
=
0
(2)
2
(
x
＋
2
)
−
49
=
0
(3)
2
(
x
＋
3
)
=
36
(4)
2
(
x
−
4
)
=
4
(5)
2
(
x
−
1
)
−
9
=
0
(6)
2
(
x
＋
2
)
=
9
(7)
2
(
x
−
3
)
=
4
(8)
2
(
x
＋
6
)
=
9
(9)
2
(
x
＋
2
)
=
1
(10)
2
(
x
−
5
)
=
49
(11)
2
(
x
−
3
)
−
1
=
0
(12)
2
(
x
＋
7
)
−
5
=
0
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
5
)
−
9
=
0
x
＋
5
=
±
3
x
=
−
5
±
3
x
=
−2
，
−8
(2)
2
(
x
＋
2
)
−
49
=
0
x
＋
2
=
±
7
x
=
−
2
±
7
x
=
5
，
−9
(3)
2
(
x
＋
3
)
=
36
x
＋
3
=
±
6
x
=
−
3
±
6
x
=
3
，
−9
(4)
2
(
x
−
4
)
=
4
x
−
4
=
±
2
x
=
4
±
2
x
=
6
，
2
(5)
2
(
x
−
1
)
−
9
=
0
x
−
1
=
±
3
x
=
1
±
3
x
=
4
，
−2
(6)
2
(
x
＋
2
)
=
9
x
＋
2
=
±
3
x
=
−
2
±
3
x
=
1
，
−5
(7)
2
(
x
−
3
)
=
4
x
−
3
=
±
2
x
=
3
±
2
x
=
5
，
1
(8)
2
(
x
＋
6
)
=
9
x
＋
6
=
±
3
x
=
−
6
±
3
x
=
−3
，
−9
(9)
2
(
x
＋
2
)
=
1
x
＋
2
=
±
1
x
=
−
2
±
1
x
=
−1
，
−3
(10)
2
(
x
−
5
)
=
49
x
−
5
=
±
7
x
=
5
±
7
x
=
12
，
−2
(11)
2
(
x
−
3
)
−
1
=
0
x
−
3
=
±
1
x
=
3
±
1
x
=
4
，
2
(12)
2
(
x
＋
7
)
−
5
=
0
x
＋
7
5
=
±
x
5
=
−
7
±