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