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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
＋
9
)
−
1
=
0
(2)
2
(
x
＋
2
)
=
25
(3)
2
(
x
−
6
)
−
36
=
0
(4)
2
(
x
＋
7
)
=
100
(5)
2
(
x
＋
2
)
−
36
=
0
(6)
2
(
x
＋
10
)
=
4
(7)
2
(
x
＋
4
)
=
7
(8)
2
(
x
−
5
)
=
1
(9)
2
(
x
−
7
)
=
49
(10)
2
(
x
−
6
)
=
100
(11)
2
(
x
＋
1
)
=
16
(12)
2
(
x
＋
4
)
−
10
=
0
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
9
)
−
1
=
0
x
＋
9
=
±
1
x
=
−
9
±
1
x
=
−8
，
−10
(2)
2
(
x
＋
2
)
=
25
x
＋
2
=
±
5
x
=
−
2
±
5
x
=
3
，
−7
(3)
2
(
x
−
6
)
−
36
=
0
x
−
6
=
±
6
x
=
6
±
6
x
=
12
，
0
(4)
2
(
x
＋
7
)
=
100
x
＋
7
=
±
10
x
=
−
7
±
10
x
=
3
，
−17
(5)
2
(
x
＋
2
)
−
36
=
0
x
＋
2
=
±
6
x
=
−
2
±
6
x
=
4
，
−8
(6)
2
(
x
＋
10
)
=
4
x
＋
10
=
±
2
x
=
−
10
±
2
x
=
−8
，
−12
(7)
2
(
x
＋
4
)
=
7
x
＋
4
7
=
±
x
7
=
−
4
±
(8)
2
(
x
−
5
)
=
1
x
−
5
=
±
1
x
=
5
±
1
x
=
6
，
4
(9)
2
(
x
−
7
)
=
49
x
−
7
=
±
7
x
=
7
±
7
x
=
14
，
0
(10)
2
(
x
−
6
)
=
100
x
−
6
=
±
10
x
=
6
±
10
x
=
16
，
−4
(11)
2
(
x
＋
1
)
=
16
x
＋
1
=
±
4
x
=
−
1
±
4
x
=
3
，
−5
(12)
2
(
x
＋
4
)
−
10
=
0
x
＋
4
10
=
±
x
10
=
−
4
±