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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
＋
10
)
=
81
(2)
2
(
x
−
7
)
=
2
(3)
2
(
x
＋
1
)
−
6
=
0
(4)
2
(
x
＋
2
)
−
4
=
0
(5)
2
(
x
＋
6
)
=
2
(6)
2
(
x
−
7
)
=
16
(7)
2
(
x
＋
6
)
−
36
=
0
(8)
2
(
x
−
2
)
=
64
(9)
2
(
x
＋
2
)
−
1
=
0
(10)
2
(
x
−
6
)
=
25
(11)
2
(
x
＋
6
)
−
36
=
0
(12)
2
(
x
＋
10
)
−
16
=
0
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
10
)
=
81
x
＋
10
=
±
9
x
=
−
10
±
9
x
=
−1
，
−19
(2)
2
(
x
−
7
)
=
2
x
−
7
2
=
±
x
2
=
7
±
(3)
2
(
x
＋
1
)
−
6
=
0
x
＋
1
6
=
±
x
6
=
−
1
±
(4)
2
(
x
＋
2
)
−
4
=
0
x
＋
2
=
±
2
x
=
−
2
±
2
x
=
0
，
−4
(5)
2
(
x
＋
6
)
=
2
x
＋
6
2
=
±
x
2
=
−
6
±
(6)
2
(
x
−
7
)
=
16
x
−
7
=
±
4
x
=
7
±
4
x
=
11
，
3
(7)
2
(
x
＋
6
)
−
36
=
0
x
＋
6
=
±
6
x
=
−
6
±
6
x
=
0
，
−12
(8)
2
(
x
−
2
)
=
64
x
−
2
=
±
8
x
=
2
±
8
x
=
10
，
−6
(9)
2
(
x
＋
2
)
−
1
=
0
x
＋
2
=
±
1
x
=
−
2
±
1
x
=
−1
，
−3
(10)
2
(
x
−
6
)
=
25
x
−
6
=
±
5
x
=
6
±
5
x
=
11
，
1
(11)
2
(
x
＋
6
)
−
36
=
0
x
＋
6
=
±
6
x
=
−
6
±
6
x
=
0
，
−12
(12)
2
(
x
＋
10
)
−
16
=
0
x
＋
10
=
±
4
x
=
−
10
±
4
x
=
−6
，
−14