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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
)
−
9
=
0
(2)
2
(
x
＋
10
)
=
4
(3)
2
(
x
＋
5
)
=
2
(4)
2
(
x
＋
8
)
=
49
(5)
2
(
x
＋
6
)
=
1
(6)
2
(
x
−
6
)
−
4
=
0
(7)
2
(
x
＋
9
)
=
9
(8)
2
(
x
−
3
)
=
1
(9)
2
(
x
−
4
)
=
16
(10)
2
(
x
−
6
)
=
6
(11)
2
(
x
−
2
)
=
100
(12)
2
(
x
＋
6
)
=
4
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
−
6
)
−
9
=
0
x
−
6
=
±
3
x
=
6
±
3
x
=
9
，
3
(2)
2
(
x
＋
10
)
=
4
x
＋
10
=
±
2
x
=
−
10
±
2
x
=
−8
，
−12
(3)
2
(
x
＋
5
)
=
2
x
＋
5
2
=
±
x
2
=
−
5
±
(4)
2
(
x
＋
8
)
=
49
x
＋
8
=
±
7
x
=
−
8
±
7
x
=
−1
，
−15
(5)
2
(
x
＋
6
)
=
1
x
＋
6
=
±
1
x
=
−
6
±
1
x
=
−5
，
−7
(6)
2
(
x
−
6
)
−
4
=
0
x
−
6
=
±
2
x
=
6
±
2
x
=
8
，
4
(7)
2
(
x
＋
9
)
=
9
x
＋
9
=
±
3
x
=
−
9
±
3
x
=
−6
，
−12
(8)
2
(
x
−
3
)
=
1
x
−
3
=
±
1
x
=
3
±
1
x
=
4
，
2
(9)
2
(
x
−
4
)
=
16
x
−
4
=
±
4
x
=
4
±
4
x
=
8
，
0
(10)
2
(
x
−
6
)
=
6
x
−
6
6
=
±
x
6
=
6
±
(11)
2
(
x
−
2
)
=
100
x
−
2
=
±
10
x
=
2
±
10
x
=
12
，
−8
(12)
2
(
x
＋
6
)
=
4
x
＋
6
=
±
2
x
=
−
6
±
2
x
=
−4
，
−8