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