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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
)
=
5
(2)
2
(
x
＋
4
)
=
1
(3)
2
(
x
＋
2
)
=
25
(4)
2
(
x
−
1
)
=
3
(5)
2
(
x
＋
5
)
−
49
=
0
(6)
2
(
x
−
7
)
−
2
=
0
(7)
2
(
x
−
1
)
=
9
(8)
2
(
x
＋
10
)
−
9
=
0
(9)
2
(
x
＋
6
)
=
16
(10)
2
(
x
＋
2
)
=
4
(11)
2
(
x
＋
9
)
=
49
(12)
2
(
x
＋
4
)
−
1
=
0
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
10
)
=
5
x
＋
10
5
=
±
x
5
=
−
10
±
(2)
2
(
x
＋
4
)
=
1
x
＋
4
=
±
1
x
=
−
4
±
1
x
=
−3
，
−5
(3)
2
(
x
＋
2
)
=
25
x
＋
2
=
±
5
x
=
−
2
±
5
x
=
3
，
−7
(4)
2
(
x
−
1
)
=
3
x
−
1
3
=
±
x
3
=
1
±
(5)
2
(
x
＋
5
)
−
49
=
0
x
＋
5
=
±
7
x
=
−
5
±
7
x
=
2
，
−12
(6)
2
(
x
−
7
)
−
2
=
0
x
−
7
2
=
±
x
2
=
7
±
(7)
2
(
x
−
1
)
=
9
x
−
1
=
±
3
x
=
1
±
3
x
=
4
，
−2
(8)
2
(
x
＋
10
)
−
9
=
0
x
＋
10
=
±
3
x
=
−
10
±
3
x
=
−7
，
−13
(9)
2
(
x
＋
6
)
=
16
x
＋
6
=
±
4
x
=
−
6
±
4
x
=
−2
，
−10
(10)
2
(
x
＋
2
)
=
4
x
＋
2
=
±
2
x
=
−
2
±
2
x
=
0
，
−4
(11)
2
(
x
＋
9
)
=
49
x
＋
9
=
±
7
x
=
−
9
±
7
x
=
−2
，
−16
(12)
2
(
x
＋
4
)
−
1
=
0
x
＋
4
=
±
1
x
=
−
4
±
1
x
=
−3
，
−5