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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
=
0
(2)
2
(
x
＋
5
)
−
9
=
0
(3)
2
(
x
−
1
)
−
2
=
0
(4)
2
(
x
−
7
)
=
16
(5)
2
(
x
＋
2
)
=
2
(6)
2
(
x
−
3
)
=
1
(7)
2
(
x
＋
9
)
=
81
(8)
2
(
x
＋
7
)
−
1
=
0
(9)
2
(
x
−
2
)
=
9
(10)
2
(
x
＋
3
)
−
25
=
0
(11)
2
(
x
＋
7
)
=
49
(12)
2
(
x
−
5
)
=
1
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
−
7
)
−
5
=
0
x
−
7
5
=
±
x
5
=
7
±
(2)
2
(
x
＋
5
)
−
9
=
0
x
＋
5
=
±
3
x
=
−
5
±
3
x
=
−2
，
−8
(3)
2
(
x
−
1
)
−
2
=
0
x
−
1
2
=
±
x
2
=
1
±
(4)
2
(
x
−
7
)
=
16
x
−
7
=
±
4
x
=
7
±
4
x
=
11
，
3
(5)
2
(
x
＋
2
)
=
2
x
＋
2
2
=
±
x
2
=
−
2
±
(6)
2
(
x
−
3
)
=
1
x
−
3
=
±
1
x
=
3
±
1
x
=
4
，
2
(7)
2
(
x
＋
9
)
=
81
x
＋
9
=
±
9
x
=
−
9
±
9
x
=
0
，
−18
(8)
2
(
x
＋
7
)
−
1
=
0
x
＋
7
=
±
1
x
=
−
7
±
1
x
=
−6
，
−8
(9)
2
(
x
−
2
)
=
9
x
−
2
=
±
3
x
=
2
±
3
x
=
5
，
−1
(10)
2
(
x
＋
3
)
−
25
=
0
x
＋
3
=
±
5
x
=
−
3
±
5
x
=
2
，
−8
(11)
2
(
x
＋
7
)
=
49
x
＋
7
=
±
7
x
=
−
7
±
7
x
=
0
，
−14
(12)
2
(
x
−
5
)
=
1
x
−
5
=
±
1
x
=
5
±
1
x
=
6
，
4