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