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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
)
=
1
(2)
2
(
x
＋
5
)
=
9
(3)
2
(
x
＋
7
)
−
3
=
0
(4)
2
(
x
＋
4
)
=
4
(5)
2
(
x
＋
6
)
−
1
=
0
(6)
2
(
x
−
4
)
=
1
(7)
2
(
x
＋
10
)
=
6
(8)
2
(
x
−
6
)
−
100
=
0
(9)
2
(
x
＋
1
)
=
9
(10)
2
(
x
＋
5
)
=
25
(11)
2
(
x
＋
5
)
−
25
=
0
(12)
2
(
x
−
4
)
=
9
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
−
4
)
=
1
x
−
4
=
±
1
x
=
4
±
1
x
=
5
，
3
(2)
2
(
x
＋
5
)
=
9
x
＋
5
=
±
3
x
=
−
5
±
3
x
=
−2
，
−8
(3)
2
(
x
＋
7
)
−
3
=
0
x
＋
7
3
=
±
x
3
=
−
7
±
(4)
2
(
x
＋
4
)
=
4
x
＋
4
=
±
2
x
=
−
4
±
2
x
=
−2
，
−6
(5)
2
(
x
＋
6
)
−
1
=
0
x
＋
6
=
±
1
x
=
−
6
±
1
x
=
−5
，
−7
(6)
2
(
x
−
4
)
=
1
x
−
4
=
±
1
x
=
4
±
1
x
=
5
，
3
(7)
2
(
x
＋
10
)
=
6
x
＋
10
6
=
±
x
6
=
−
10
±
(8)
2
(
x
−
6
)
−
100
=
0
x
−
6
=
±
10
x
=
6
±
10
x
=
16
，
−4
(9)
2
(
x
＋
1
)
=
9
x
＋
1
=
±
3
x
=
−
1
±
3
x
=
2
，
−4
(10)
2
(
x
＋
5
)
=
25
x
＋
5
=
±
5
x
=
−
5
±
5
x
=
0
，
−10
(11)
2
(
x
＋
5
)
−
25
=
0
x
＋
5
=
±
5
x
=
−
5
±
5
x
=
0
，
−10
(12)
2
(
x
−
4
)
=
9
x
−
4
=
±
3
x
=
4
±
3
x
=
7
，
1