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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
＋
8
)
−
9
=
0
(2)
2
(
x
−
1
)
−
9
=
0
(3)
2
(
x
−
2
)
=
16
(4)
2
(
x
−
3
)
−
5
=
0
(5)
2
(
x
＋
3
)
=
1
(6)
2
(
x
−
6
)
=
8
(7)
2
(
x
＋
3
)
=
81
(8)
2
(
x
＋
3
)
=
25
(9)
2
(
x
＋
6
)
−
1
=
0
(10)
2
(
x
＋
6
)
=
36
(11)
2
(
x
＋
9
)
−
25
=
0
(12)
2
(
x
＋
9
)
=
64
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
8
)
−
9
=
0
x
＋
8
=
±
3
x
=
−
8
±
3
x
=
−5
，
−11
(2)
2
(
x
−
1
)
−
9
=
0
x
−
1
=
±
3
x
=
1
±
3
x
=
4
，
−2
(3)
2
(
x
−
2
)
=
16
x
−
2
=
±
4
x
=
2
±
4
x
=
6
，
−2
(4)
2
(
x
−
3
)
−
5
=
0
x
−
3
5
=
±
x
5
=
3
±
(5)
2
(
x
＋
3
)
=
1
x
＋
3
=
±
1
x
=
−
3
±
1
x
=
−2
，
−4
(6)
2
(
x
−
6
)
=
8
x
−
6
2
=
±
2
x
2
=
6
±
2
(7)
2
(
x
＋
3
)
=
81
x
＋
3
=
±
9
x
=
−
3
±
9
x
=
6
，
−12
(8)
2
(
x
＋
3
)
=
25
x
＋
3
=
±
5
x
=
−
3
±
5
x
=
2
，
−8
(9)
2
(
x
＋
6
)
−
1
=
0
x
＋
6
=
±
1
x
=
−
6
±
1
x
=
−5
，
−7
(10)
2
(
x
＋
6
)
=
36
x
＋
6
=
±
6
x
=
−
6
±
6
x
=
0
，
−12
(11)
2
(
x
＋
9
)
−
25
=
0
x
＋
9
=
±
5
x
=
−
9
±
5
x
=
−4
，
−14
(12)
2
(
x
＋
9
)
=
64
x
＋
9
=
±
8
x
=
−
9
±
8
x
=
−1
，
−17