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