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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
)
−
7
=
0
(2)
2
(
x
−
3
)
=
25
(3)
2
(
x
＋
7
)
=
7
(4)
2
(
x
＋
3
)
=
100
(5)
2
(
x
＋
1
)
=
5
(6)
2
(
x
＋
3
)
=
36
(7)
2
(
x
＋
7
)
−
10
=
0
(8)
2
(
x
＋
7
)
=
10
(9)
2
(
x
＋
9
)
=
25
(10)
2
(
x
−
7
)
=
64
(11)
2
(
x
＋
10
)
−
36
=
0
(12)
2
(
x
＋
3
)
=
1
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
−
7
)
−
7
=
0
x
−
7
7
=
±
x
7
=
7
±
(2)
2
(
x
−
3
)
=
25
x
−
3
=
±
5
x
=
3
±
5
x
=
8
，
−2
(3)
2
(
x
＋
7
)
=
7
x
＋
7
7
=
±
x
7
=
−
7
±
(4)
2
(
x
＋
3
)
=
100
x
＋
3
=
±
10
x
=
−
3
±
10
x
=
7
，
−13
(5)
2
(
x
＋
1
)
=
5
x
＋
1
5
=
±
x
5
=
−
1
±
(6)
2
(
x
＋
3
)
=
36
x
＋
3
=
±
6
x
=
−
3
±
6
x
=
3
，
−9
(7)
2
(
x
＋
7
)
−
10
=
0
x
＋
7
10
=
±
x
10
=
−
7
±
(8)
2
(
x
＋
7
)
=
10
x
＋
7
10
=
±
x
10
=
−
7
±
(9)
2
(
x
＋
9
)
=
25
x
＋
9
=
±
5
x
=
−
9
±
5
x
=
−4
，
−14
(10)
2
(
x
−
7
)
=
64
x
−
7
=
±
8
x
=
7
±
8
x
=
15
，
−1
(11)
2
(
x
＋
10
)
−
36
=
0
x
＋
10
=
±
6
x
=
−
10
±
6
x
=
−4
，
−16
(12)
2
(
x
＋
3
)
=
1
x
＋
3
=
±
1
x
=
−
3
±
1
x
=
−2
，
−4