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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
−
5
)
−
25
=
0
(2)
2
(
x
−
5
)
=
49
(3)
2
(
x
−
4
)
−
64
=
0
(4)
2
(
x
＋
7
)
=
64
(5)
2
(
x
＋
5
)
=
6
(6)
2
(
x
＋
1
)
=
4
(7)
2
(
x
＋
9
)
=
16
(8)
2
(
x
＋
8
)
=
36
(9)
2
(
x
＋
6
)
=
9
(10)
2
(
x
＋
10
)
=
7
(11)
2
(
x
＋
6
)
−
10
=
0
(12)
2
(
x
−
2
)
=
2
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
−
5
)
−
25
=
0
x
−
5
=
±
5
x
=
5
±
5
x
=
10
，
0
(2)
2
(
x
−
5
)
=
49
x
−
5
=
±
7
x
=
5
±
7
x
=
12
，
−2
(3)
2
(
x
−
4
)
−
64
=
0
x
−
4
=
±
8
x
=
4
±
8
x
=
12
，
−4
(4)
2
(
x
＋
7
)
=
64
x
＋
7
=
±
8
x
=
−
7
±
8
x
=
1
，
−15
(5)
2
(
x
＋
5
)
=
6
x
＋
5
6
=
±
x
6
=
−
5
±
(6)
2
(
x
＋
1
)
=
4
x
＋
1
=
±
2
x
=
−
1
±
2
x
=
1
，
−3
(7)
2
(
x
＋
9
)
=
16
x
＋
9
=
±
4
x
=
−
9
±
4
x
=
−5
，
−13
(8)
2
(
x
＋
8
)
=
36
x
＋
8
=
±
6
x
=
−
8
±
6
x
=
−2
，
−14
(9)
2
(
x
＋
6
)
=
9
x
＋
6
=
±
3
x
=
−
6
±
3
x
=
−3
，
−9
(10)
2
(
x
＋
10
)
=
7
x
＋
10
7
=
±
x
7
=
−
10
±
(11)
2
(
x
＋
6
)
−
10
=
0
x
＋
6
10
=
±
x
10
=
−
6
±
(12)
2
(
x
−
2
)
=
2
x
−
2
2
=
±
x
2
=
2
±