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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
＋
3
)
−
4
=
0
(2)
2
(
x
＋
9
)
=
9
(3)
2
(
x
＋
3
)
=
1
(4)
2
(
x
＋
4
)
=
25
(5)
2
(
x
＋
9
)
−
7
=
0
(6)
2
(
x
−
2
)
=
36
(7)
2
(
x
＋
5
)
=
25
(8)
2
(
x
＋
6
)
=
8
(9)
2
(
x
＋
6
)
−
9
=
0
(10)
2
(
x
−
5
)
=
1
(11)
2
(
x
＋
9
)
=
25
(12)
2
(
x
＋
9
)
=
3
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
3
)
−
4
=
0
x
＋
3
=
±
2
x
=
−
3
±
2
x
=
−1
，
−5
(2)
2
(
x
＋
9
)
=
9
x
＋
9
=
±
3
x
=
−
9
±
3
x
=
−6
，
−12
(3)
2
(
x
＋
3
)
=
1
x
＋
3
=
±
1
x
=
−
3
±
1
x
=
−2
，
−4
(4)
2
(
x
＋
4
)
=
25
x
＋
4
=
±
5
x
=
−
4
±
5
x
=
1
，
−9
(5)
2
(
x
＋
9
)
−
7
=
0
x
＋
9
7
=
±
x
7
=
−
9
±
(6)
2
(
x
−
2
)
=
36
x
−
2
=
±
6
x
=
2
±
6
x
=
8
，
−4
(7)
2
(
x
＋
5
)
=
25
x
＋
5
=
±
5
x
=
−
5
±
5
x
=
0
，
−10
(8)
2
(
x
＋
6
)
=
8
x
＋
6
2
=
±
2
x
2
=
−
6
±
2
(9)
2
(
x
＋
6
)
−
9
=
0
x
＋
6
=
±
3
x
=
−
6
±
3
x
=
−3
，
−9
(10)
2
(
x
−
5
)
=
1
x
−
5
=
±
1
x
=
5
±
1
x
=
6
，
4
(11)
2
(
x
＋
9
)
=
25
x
＋
9
=
±
5
x
=
−
9
±
5
x
=
−4
，
−14
(12)
2
(
x
＋
9
)
=
3
x
＋
9
3
=
±
x
3
=
−
9
±