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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
＋
3
)
=
9
(2)
2
(
x
＋
1
)
=
49
(3)
2
(
x
−
3
)
=
81
(4)
2
(
x
＋
3
)
=
16
(5)
2
(
x
＋
6
)
=
64
(6)
2
(
x
＋
3
)
−
4
=
0
(7)
2
(
x
−
3
)
−
49
=
0
(8)
2
(
x
−
1
)
−
100
=
0
(9)
2
(
x
＋
6
)
−
6
=
0
(10)
2
(
x
＋
1
)
−
9
=
0
(11)
2
(
x
＋
10
)
=
9
(12)
2
(
x
−
2
)
−
5
=
0
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
3
)
=
9
x
＋
3
=
±
3
x
=
−
3
±
3
x
=
0
，
−6
(2)
2
(
x
＋
1
)
=
49
x
＋
1
=
±
7
x
=
−
1
±
7
x
=
6
，
−8
(3)
2
(
x
−
3
)
=
81
x
−
3
=
±
9
x
=
3
±
9
x
=
12
，
−6
(4)
2
(
x
＋
3
)
=
16
x
＋
3
=
±
4
x
=
−
3
±
4
x
=
1
，
−7
(5)
2
(
x
＋
6
)
=
64
x
＋
6
=
±
8
x
=
−
6
±
8
x
=
2
，
−14
(6)
2
(
x
＋
3
)
−
4
=
0
x
＋
3
=
±
2
x
=
−
3
±
2
x
=
−1
，
−5
(7)
2
(
x
−
3
)
−
49
=
0
x
−
3
=
±
7
x
=
3
±
7
x
=
10
，
−4
(8)
2
(
x
−
1
)
−
100
=
0
x
−
1
=
±
10
x
=
1
±
10
x
=
11
，
−9
(9)
2
(
x
＋
6
)
−
6
=
0
x
＋
6
6
=
±
x
6
=
−
6
±
(10)
2
(
x
＋
1
)
−
9
=
0
x
＋
1
=
±
3
x
=
−
1
±
3
x
=
2
，
−4
(11)
2
(
x
＋
10
)
=
9
x
＋
10
=
±
3
x
=
−
10
±
3
x
=
−7
，
−13
(12)
2
(
x
−
2
)
−
5
=
0
x
−
2
5
=
±
x
5
=
2
±