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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
＋
2
)
=
2
(2)
2
(
x
−
4
)
−
9
=
0
(3)
2
(
x
＋
8
)
=
36
(4)
2
(
x
＋
10
)
=
4
(5)
2
(
x
＋
5
)
=
25
(6)
2
(
x
＋
9
)
=
8
(7)
2
(
x
＋
3
)
−
49
=
0
(8)
2
(
x
−
6
)
−
7
=
0
(9)
2
(
x
＋
8
)
=
81
(10)
2
(
x
＋
9
)
−
6
=
0
(11)
2
(
x
＋
1
)
=
49
(12)
2
(
x
＋
9
)
=
49
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
2
)
=
2
x
＋
2
2
=
±
x
2
=
−
2
±
(2)
2
(
x
−
4
)
−
9
=
0
x
−
4
=
±
3
x
=
4
±
3
x
=
7
，
1
(3)
2
(
x
＋
8
)
=
36
x
＋
8
=
±
6
x
=
−
8
±
6
x
=
−2
，
−14
(4)
2
(
x
＋
10
)
=
4
x
＋
10
=
±
2
x
=
−
10
±
2
x
=
−8
，
−12
(5)
2
(
x
＋
5
)
=
25
x
＋
5
=
±
5
x
=
−
5
±
5
x
=
0
，
−10
(6)
2
(
x
＋
9
)
=
8
x
＋
9
2
=
±
2
x
2
=
−
9
±
2
(7)
2
(
x
＋
3
)
−
49
=
0
x
＋
3
=
±
7
x
=
−
3
±
7
x
=
4
，
−10
(8)
2
(
x
−
6
)
−
7
=
0
x
−
6
7
=
±
x
7
=
6
±
(9)
2
(
x
＋
8
)
=
81
x
＋
8
=
±
9
x
=
−
8
±
9
x
=
1
，
−17
(10)
2
(
x
＋
9
)
−
6
=
0
x
＋
9
6
=
±
x
6
=
−
9
±
(11)
2
(
x
＋
1
)
=
49
x
＋
1
=
±
7
x
=
−
1
±
7
x
=
6
，
−8
(12)
2
(
x
＋
9
)
=
49
x
＋
9
=
±
7
x
=
−
9
±
7
x
=
−2
，
−16