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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
−
5
)
=
10
(2)
2
(
x
＋
4
)
=
36
(3)
2
(
x
−
6
)
=
36
(4)
2
(
x
＋
2
)
=
25
(5)
2
(
x
＋
8
)
=
49
(6)
2
(
x
＋
4
)
=
9
(7)
2
(
x
−
6
)
−
3
=
0
(8)
2
(
x
＋
4
)
=
7
(9)
2
(
x
＋
9
)
−
25
=
0
(10)
2
(
x
−
2
)
=
4
(11)
2
(
x
−
2
)
−
4
=
0
(12)
2
(
x
＋
3
)
−
100
=
0
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
−
5
)
=
10
x
−
5
10
=
±
x
10
=
5
±
(2)
2
(
x
＋
4
)
=
36
x
＋
4
=
±
6
x
=
−
4
±
6
x
=
2
，
−10
(3)
2
(
x
−
6
)
=
36
x
−
6
=
±
6
x
=
6
±
6
x
=
12
，
0
(4)
2
(
x
＋
2
)
=
25
x
＋
2
=
±
5
x
=
−
2
±
5
x
=
3
，
−7
(5)
2
(
x
＋
8
)
=
49
x
＋
8
=
±
7
x
=
−
8
±
7
x
=
−1
，
−15
(6)
2
(
x
＋
4
)
=
9
x
＋
4
=
±
3
x
=
−
4
±
3
x
=
−1
，
−7
(7)
2
(
x
−
6
)
−
3
=
0
x
−
6
3
=
±
x
3
=
6
±
(8)
2
(
x
＋
4
)
=
7
x
＋
4
7
=
±
x
7
=
−
4
±
(9)
2
(
x
＋
9
)
−
25
=
0
x
＋
9
=
±
5
x
=
−
9
±
5
x
=
−4
，
−14
(10)
2
(
x
−
2
)
=
4
x
−
2
=
±
2
x
=
2
±
2
x
=
4
，
0
(11)
2
(
x
−
2
)
−
4
=
0
x
−
2
=
±
2
x
=
2
±
2
x
=
4
，
0
(12)
2
(
x
＋
3
)
−
100
=
0
x
＋
3
=
±
10
x
=
−
3
±
10
x
=
7
，
−13