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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
＋
7
)
−
1
=
0
(2)
2
(
x
−
1
)
=
49
(3)
2
(
x
＋
7
)
−
16
=
0
(4)
2
(
x
−
1
)
−
36
=
0
(5)
2
(
x
＋
6
)
=
81
(6)
2
(
x
＋
1
)
=
36
(7)
2
(
x
＋
5
)
=
25
(8)
2
(
x
−
2
)
=
100
(9)
2
(
x
＋
6
)
=
36
(10)
2
(
x
＋
3
)
=
7
(11)
2
(
x
−
6
)
=
100
(12)
2
(
x
＋
7
)
=
49
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
7
)
−
1
=
0
x
＋
7
=
±
1
x
=
−
7
±
1
x
=
−6
，
−8
(2)
2
(
x
−
1
)
=
49
x
−
1
=
±
7
x
=
1
±
7
x
=
8
，
−6
(3)
2
(
x
＋
7
)
−
16
=
0
x
＋
7
=
±
4
x
=
−
7
±
4
x
=
−3
，
−11
(4)
2
(
x
−
1
)
−
36
=
0
x
−
1
=
±
6
x
=
1
±
6
x
=
7
，
−5
(5)
2
(
x
＋
6
)
=
81
x
＋
6
=
±
9
x
=
−
6
±
9
x
=
3
，
−15
(6)
2
(
x
＋
1
)
=
36
x
＋
1
=
±
6
x
=
−
1
±
6
x
=
5
，
−7
(7)
2
(
x
＋
5
)
=
25
x
＋
5
=
±
5
x
=
−
5
±
5
x
=
0
，
−10
(8)
2
(
x
−
2
)
=
100
x
−
2
=
±
10
x
=
2
±
10
x
=
12
，
−8
(9)
2
(
x
＋
6
)
=
36
x
＋
6
=
±
6
x
=
−
6
±
6
x
=
0
，
−12
(10)
2
(
x
＋
3
)
=
7
x
＋
3
7
=
±
x
7
=
−
3
±
(11)
2
(
x
−
6
)
=
100
x
−
6
=
±
10
x
=
6
±
10
x
=
16
，
−4
(12)
2
(
x
＋
7
)
=
49
x
＋
7
=
±
7
x
=
−
7
±
7
x
=
0
，
−14