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