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