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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
＋
6
)
=
2
(2)
2
(
x
−
5
)
−
1
=
0
(3)
2
(
x
＋
3
)
−
6
=
0
(4)
2
(
x
＋
9
)
=
36
(5)
2
(
x
−
7
)
−
1
=
0
(6)
2
(
x
＋
6
)
=
7
(7)
2
(
x
−
5
)
=
64
(8)
2
(
x
＋
1
)
=
3
(9)
2
(
x
＋
3
)
−
4
=
0
(10)
2
(
x
−
1
)
=
6
(11)
2
(
x
−
5
)
−
81
=
0
(12)
2
(
x
＋
9
)
=
36
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
6
)
=
2
x
＋
6
2
=
±
x
2
=
−
6
±
(2)
2
(
x
−
5
)
−
1
=
0
x
−
5
=
±
1
x
=
5
±
1
x
=
6
，
4
(3)
2
(
x
＋
3
)
−
6
=
0
x
＋
3
6
=
±
x
6
=
−
3
±
(4)
2
(
x
＋
9
)
=
36
x
＋
9
=
±
6
x
=
−
9
±
6
x
=
−3
，
−15
(5)
2
(
x
−
7
)
−
1
=
0
x
−
7
=
±
1
x
=
7
±
1
x
=
8
，
6
(6)
2
(
x
＋
6
)
=
7
x
＋
6
7
=
±
x
7
=
−
6
±
(7)
2
(
x
−
5
)
=
64
x
−
5
=
±
8
x
=
5
±
8
x
=
13
，
−3
(8)
2
(
x
＋
1
)
=
3
x
＋
1
3
=
±
x
3
=
−
1
±
(9)
2
(
x
＋
3
)
−
4
=
0
x
＋
3
=
±
2
x
=
−
3
±
2
x
=
−1
，
−5
(10)
2
(
x
−
1
)
=
6
x
−
1
6
=
±
x
6
=
1
±
(11)
2
(
x
−
5
)
−
81
=
0
x
−
5
=
±
9
x
=
5
±
9
x
=
14
，
−4
(12)
2
(
x
＋
9
)
=
36
x
＋
9
=
±
6
x
=
−
9
±
6
x
=
−3
，
−15