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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
＋
7
)
=
5
(2)
2
(
x
＋
5
)
=
100
(3)
2
(
x
＋
10
)
=
1
(4)
2
(
x
−
5
)
=
4
(5)
2
(
x
＋
6
)
=
25
(6)
2
(
x
＋
5
)
−
25
=
0
(7)
2
(
x
−
5
)
=
25
(8)
2
(
x
＋
5
)
=
25
(9)
2
(
x
＋
2
)
=
9
(10)
2
(
x
−
6
)
=
64
(11)
2
(
x
＋
7
)
=
4
(12)
2
(
x
−
2
)
=
1
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
7
)
=
5
x
＋
7
5
=
±
x
5
=
−
7
±
(2)
2
(
x
＋
5
)
=
100
x
＋
5
=
±
10
x
=
−
5
±
10
x
=
5
，
−15
(3)
2
(
x
＋
10
)
=
1
x
＋
10
=
±
1
x
=
−
10
±
1
x
=
−9
，
−11
(4)
2
(
x
−
5
)
=
4
x
−
5
=
±
2
x
=
5
±
2
x
=
7
，
3
(5)
2
(
x
＋
6
)
=
25
x
＋
6
=
±
5
x
=
−
6
±
5
x
=
−1
，
−11
(6)
2
(
x
＋
5
)
−
25
=
0
x
＋
5
=
±
5
x
=
−
5
±
5
x
=
0
，
−10
(7)
2
(
x
−
5
)
=
25
x
−
5
=
±
5
x
=
5
±
5
x
=
10
，
0
(8)
2
(
x
＋
5
)
=
25
x
＋
5
=
±
5
x
=
−
5
±
5
x
=
0
，
−10
(9)
2
(
x
＋
2
)
=
9
x
＋
2
=
±
3
x
=
−
2
±
3
x
=
1
，
−5
(10)
2
(
x
−
6
)
=
64
x
−
6
=
±
8
x
=
6
±
8
x
=
14
，
−2
(11)
2
(
x
＋
7
)
=
4
x
＋
7
=
±
2
x
=
−
7
±
2
x
=
−5
，
−9
(12)
2
(
x
−
2
)
=
1
x
−
2
=
±
1
x
=
2
±
1
x
=
3
，
1