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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
)
=
2
(2)
2
(
x
＋
1
)
=
8
(3)
2
(
x
−
7
)
=
25
(4)
2
(
x
−
4
)
=
36
(5)
2
(
x
＋
8
)
=
4
(6)
2
(
x
＋
9
)
−
4
=
0
(7)
2
(
x
＋
2
)
=
1
(8)
2
(
x
−
3
)
=
4
(9)
2
(
x
−
1
)
−
49
=
0
(10)
2
(
x
−
5
)
−
1
=
0
(11)
2
(
x
＋
10
)
=
4
(12)
2
(
x
＋
4
)
=
2
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
−
4
)
=
2
x
−
4
2
=
±
x
2
=
4
±
(2)
2
(
x
＋
1
)
=
8
x
＋
1
2
=
±
2
x
2
=
−
1
±
2
(3)
2
(
x
−
7
)
=
25
x
−
7
=
±
5
x
=
7
±
5
x
=
12
，
2
(4)
2
(
x
−
4
)
=
36
x
−
4
=
±
6
x
=
4
±
6
x
=
10
，
−2
(5)
2
(
x
＋
8
)
=
4
x
＋
8
=
±
2
x
=
−
8
±
2
x
=
−6
，
−10
(6)
2
(
x
＋
9
)
−
4
=
0
x
＋
9
=
±
2
x
=
−
9
±
2
x
=
−7
，
−11
(7)
2
(
x
＋
2
)
=
1
x
＋
2
=
±
1
x
=
−
2
±
1
x
=
−1
，
−3
(8)
2
(
x
−
3
)
=
4
x
−
3
=
±
2
x
=
3
±
2
x
=
5
，
1
(9)
2
(
x
−
1
)
−
49
=
0
x
−
1
=
±
7
x
=
1
±
7
x
=
8
，
−6
(10)
2
(
x
−
5
)
−
1
=
0
x
−
5
=
±
1
x
=
5
±
1
x
=
6
，
4
(11)
2
(
x
＋
10
)
=
4
x
＋
10
=
±
2
x
=
−
10
±
2
x
=
−8
，
−12
(12)
2
(
x
＋
4
)
=
2
x
＋
4
2
=
±
x
2
=
−
4
±