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©2025 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
)
=
8
(2)
2
(
x
−
5
)
−
16
=
0
(3)
2
(
x
−
5
)
=
25
(4)
2
(
x
＋
10
)
=
4
(5)
2
(
x
−
3
)
=
7
(6)
2
(
x
＋
6
)
=
81
(7)
2
(
x
＋
10
)
−
100
=
0
(8)
2
(
x
−
1
)
=
9
(9)
2
(
x
−
4
)
=
81
(10)
2
(
x
＋
3
)
=
9
(11)
2
(
x
＋
2
)
−
6
=
0
(12)
2
(
x
＋
7
)
=
7
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
2
)
=
8
x
＋
2
2
=
±
2
x
2
=
−
2
±
2
(2)
2
(
x
−
5
)
−
16
=
0
x
−
5
=
±
4
x
=
5
±
4
x
=
9
，
1
(3)
2
(
x
−
5
)
=
25
x
−
5
=
±
5
x
=
5
±
5
x
=
10
，
0
(4)
2
(
x
＋
10
)
=
4
x
＋
10
=
±
2
x
=
−
10
±
2
x
=
−8
，
−12
(5)
2
(
x
−
3
)
=
7
x
−
3
7
=
±
x
7
=
3
±
(6)
2
(
x
＋
6
)
=
81
x
＋
6
=
±
9
x
=
−
6
±
9
x
=
3
，
−15
(7)
2
(
x
＋
10
)
−
100
=
0
x
＋
10
=
±
10
x
=
−
10
±
10
x
=
0
，
−20
(8)
2
(
x
−
1
)
=
9
x
−
1
=
±
3
x
=
1
±
3
x
=
4
，
−2
(9)
2
(
x
−
4
)
=
81
x
−
4
=
±
9
x
=
4
±
9
x
=
13
，
−5
(10)
2
(
x
＋
3
)
=
9
x
＋
3
=
±
3
x
=
−
3
±
3
x
=
0
，
−6
(11)
2
(
x
＋
2
)
−
6
=
0
x
＋
2
6
=
±
x
6
=
−
2
±
(12)
2
(
x
＋
7
)
=
7
x
＋
7
7
=
±
x
7
=
−
7
±