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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
−
3
)
=
1
(3)
2
(
x
＋
1
)
=
25
(4)
2
(
x
＋
10
)
=
25
(5)
2
(
x
＋
9
)
=
16
(6)
2
(
x
−
4
)
=
9
(7)
2
(
x
＋
3
)
=
16
(8)
2
(
x
＋
6
)
=
1
(9)
2
(
x
＋
5
)
−
9
=
0
(10)
2
(
x
−
6
)
=
36
(11)
2
(
x
−
5
)
=
5
(12)
2
(
x
＋
4
)
=
36
©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
−
3
)
=
1
x
−
3
=
±
1
x
=
3
±
1
x
=
4
，
2
(3)
2
(
x
＋
1
)
=
25
x
＋
1
=
±
5
x
=
−
1
±
5
x
=
4
，
−6
(4)
2
(
x
＋
10
)
=
25
x
＋
10
=
±
5
x
=
−
10
±
5
x
=
−5
，
−15
(5)
2
(
x
＋
9
)
=
16
x
＋
9
=
±
4
x
=
−
9
±
4
x
=
−5
，
−13
(6)
2
(
x
−
4
)
=
9
x
−
4
=
±
3
x
=
4
±
3
x
=
7
，
1
(7)
2
(
x
＋
3
)
=
16
x
＋
3
=
±
4
x
=
−
3
±
4
x
=
1
，
−7
(8)
2
(
x
＋
6
)
=
1
x
＋
6
=
±
1
x
=
−
6
±
1
x
=
−5
，
−7
(9)
2
(
x
＋
5
)
−
9
=
0
x
＋
5
=
±
3
x
=
−
5
±
3
x
=
−2
，
−8
(10)
2
(
x
−
6
)
=
36
x
−
6
=
±
6
x
=
6
±
6
x
=
12
，
0
(11)
2
(
x
−
5
)
=
5
x
−
5
5
=
±
x
5
=
5
±
(12)
2
(
x
＋
4
)
=
36
x
＋
4
=
±
6
x
=
−
4
±
6
x
=
2
，
−10