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©2025 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
)
=
9
(2)
2
(
x
＋
4
)
=
25
(3)
2
(
x
＋
10
)
−
16
=
0
(4)
2
(
x
＋
8
)
=
5
(5)
2
(
x
−
6
)
−
16
=
0
(6)
2
(
x
−
7
)
=
64
(7)
2
(
x
−
1
)
=
100
(8)
2
(
x
＋
2
)
=
36
(9)
2
(
x
＋
4
)
=
16
(10)
2
(
x
＋
1
)
=
49
(11)
2
(
x
＋
9
)
=
49
(12)
2
(
x
＋
5
)
=
36
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
−
5
)
=
9
x
−
5
=
±
3
x
=
5
±
3
x
=
8
，
2
(2)
2
(
x
＋
4
)
=
25
x
＋
4
=
±
5
x
=
−
4
±
5
x
=
1
，
−9
(3)
2
(
x
＋
10
)
−
16
=
0
x
＋
10
=
±
4
x
=
−
10
±
4
x
=
−6
，
−14
(4)
2
(
x
＋
8
)
=
5
x
＋
8
5
=
±
x
5
=
−
8
±
(5)
2
(
x
−
6
)
−
16
=
0
x
−
6
=
±
4
x
=
6
±
4
x
=
10
，
2
(6)
2
(
x
−
7
)
=
64
x
−
7
=
±
8
x
=
7
±
8
x
=
15
，
−1
(7)
2
(
x
−
1
)
=
100
x
−
1
=
±
10
x
=
1
±
10
x
=
11
，
−9
(8)
2
(
x
＋
2
)
=
36
x
＋
2
=
±
6
x
=
−
2
±
6
x
=
4
，
−8
(9)
2
(
x
＋
4
)
=
16
x
＋
4
=
±
4
x
=
−
4
±
4
x
=
0
，
−8
(10)
2
(
x
＋
1
)
=
49
x
＋
1
=
±
7
x
=
−
1
±
7
x
=
6
，
−8
(11)
2
(
x
＋
9
)
=
49
x
＋
9
=
±
7
x
=
−
9
±
7
x
=
−2
，
−16
(12)
2
(
x
＋
5
)
=
36
x
＋
5
=
±
6
x
=
−
5
±
6
x
=
1
，
−11