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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
＋
3
)
−
16
=
0
(2)
2
(
x
＋
2
)
−
9
=
0
(3)
2
(
x
−
7
)
−
6
=
0
(4)
2
(
x
＋
6
)
=
3
(5)
2
(
x
−
7
)
=
1
(6)
2
(
x
−
1
)
−
3
=
0
(7)
2
(
x
−
5
)
=
9
(8)
2
(
x
＋
2
)
=
4
(9)
2
(
x
−
4
)
=
2
(10)
2
(
x
−
6
)
=
4
(11)
2
(
x
−
1
)
=
1
(12)
2
(
x
＋
8
)
=
25
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
3
)
−
16
=
0
x
＋
3
=
±
4
x
=
−
3
±
4
x
=
1
，
−7
(2)
2
(
x
＋
2
)
−
9
=
0
x
＋
2
=
±
3
x
=
−
2
±
3
x
=
1
，
−5
(3)
2
(
x
−
7
)
−
6
=
0
x
−
7
6
=
±
x
6
=
7
±
(4)
2
(
x
＋
6
)
=
3
x
＋
6
3
=
±
x
3
=
−
6
±
(5)
2
(
x
−
7
)
=
1
x
−
7
=
±
1
x
=
7
±
1
x
=
8
，
6
(6)
2
(
x
−
1
)
−
3
=
0
x
−
1
3
=
±
x
3
=
1
±
(7)
2
(
x
−
5
)
=
9
x
−
5
=
±
3
x
=
5
±
3
x
=
8
，
2
(8)
2
(
x
＋
2
)
=
4
x
＋
2
=
±
2
x
=
−
2
±
2
x
=
0
，
−4
(9)
2
(
x
−
4
)
=
2
x
−
4
2
=
±
x
2
=
4
±
(10)
2
(
x
−
6
)
=
4
x
−
6
=
±
2
x
=
6
±
2
x
=
8
，
4
(11)
2
(
x
−
1
)
=
1
x
−
1
=
±
1
x
=
1
±
1
x
=
2
，
0
(12)
2
(
x
＋
8
)
=
25
x
＋
8
=
±
5
x
=
−
8
±
5
x
=
−3
，
−13