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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
)
−
1
=
0
(2)
2
(
x
−
1
)
=
81
(3)
2
(
x
−
1
)
−
6
=
0
(4)
2
(
x
＋
2
)
=
49
(5)
2
(
x
＋
9
)
−
9
=
0
(6)
2
(
x
＋
9
)
=
4
(7)
2
(
x
＋
8
)
−
100
=
0
(8)
2
(
x
＋
1
)
=
36
(9)
2
(
x
−
5
)
=
25
(10)
2
(
x
＋
3
)
=
36
(11)
2
(
x
−
7
)
=
1
(12)
2
(
x
＋
1
)
=
2
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
10
)
−
1
=
0
x
＋
10
=
±
1
x
=
−
10
±
1
x
=
−9
，
−11
(2)
2
(
x
−
1
)
=
81
x
−
1
=
±
9
x
=
1
±
9
x
=
10
，
−8
(3)
2
(
x
−
1
)
−
6
=
0
x
−
1
6
=
±
x
6
=
1
±
(4)
2
(
x
＋
2
)
=
49
x
＋
2
=
±
7
x
=
−
2
±
7
x
=
5
，
−9
(5)
2
(
x
＋
9
)
−
9
=
0
x
＋
9
=
±
3
x
=
−
9
±
3
x
=
−6
，
−12
(6)
2
(
x
＋
9
)
=
4
x
＋
9
=
±
2
x
=
−
9
±
2
x
=
−7
，
−11
(7)
2
(
x
＋
8
)
−
100
=
0
x
＋
8
=
±
10
x
=
−
8
±
10
x
=
2
，
−18
(8)
2
(
x
＋
1
)
=
36
x
＋
1
=
±
6
x
=
−
1
±
6
x
=
5
，
−7
(9)
2
(
x
−
5
)
=
25
x
−
5
=
±
5
x
=
5
±
5
x
=
10
，
0
(10)
2
(
x
＋
3
)
=
36
x
＋
3
=
±
6
x
=
−
3
±
6
x
=
3
，
−9
(11)
2
(
x
−
7
)
=
1
x
−
7
=
±
1
x
=
7
±
1
x
=
8
，
6
(12)
2
(
x
＋
1
)
=
2
x
＋
1
2
=
±
x
2
=
−
1
±