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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
)
=
49
(2)
2
(
x
−
7
)
=
9
(3)
2
(
x
＋
9
)
=
1
(4)
2
(
x
＋
9
)
−
25
=
0
(5)
2
(
x
−
4
)
=
1
(6)
2
(
x
＋
1
)
=
1
(7)
2
(
x
−
3
)
−
16
=
0
(8)
2
(
x
−
3
)
−
1
=
0
(9)
2
(
x
−
5
)
−
49
=
0
(10)
2
(
x
＋
9
)
=
81
(11)
2
(
x
＋
1
)
=
1
(12)
2
(
x
−
4
)
=
1
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
2
)
=
49
x
＋
2
=
±
7
x
=
−
2
±
7
x
=
5
，
−9
(2)
2
(
x
−
7
)
=
9
x
−
7
=
±
3
x
=
7
±
3
x
=
10
，
4
(3)
2
(
x
＋
9
)
=
1
x
＋
9
=
±
1
x
=
−
9
±
1
x
=
−8
，
−10
(4)
2
(
x
＋
9
)
−
25
=
0
x
＋
9
=
±
5
x
=
−
9
±
5
x
=
−4
，
−14
(5)
2
(
x
−
4
)
=
1
x
−
4
=
±
1
x
=
4
±
1
x
=
5
，
3
(6)
2
(
x
＋
1
)
=
1
x
＋
1
=
±
1
x
=
−
1
±
1
x
=
0
，
−2
(7)
2
(
x
−
3
)
−
16
=
0
x
−
3
=
±
4
x
=
3
±
4
x
=
7
，
−1
(8)
2
(
x
−
3
)
−
1
=
0
x
−
3
=
±
1
x
=
3
±
1
x
=
4
，
2
(9)
2
(
x
−
5
)
−
49
=
0
x
−
5
=
±
7
x
=
5
±
7
x
=
12
，
−2
(10)
2
(
x
＋
9
)
=
81
x
＋
9
=
±
9
x
=
−
9
±
9
x
=
0
，
−18
(11)
2
(
x
＋
1
)
=
1
x
＋
1
=
±
1
x
=
−
1
±
1
x
=
0
，
−2
(12)
2
(
x
−
4
)
=
1
x
−
4
=
±
1
x
=
4
±
1
x
=
5
，
3