［文字サイズの変更］
▼
▲
©2025 数学クラブ http://sugaku.club/
月 日（ ）
● 次の方程式を解きなさい
[211-20]
(1)
1
2
6
(
x
＋
)
−
=
0
3
7
(2)
1
2
4
(
x
＋
)
=
5
9
(3)
1
2
8
(
x
＋
)
=
5
7
(4)
2
2
16
(
x
＋
)
=
7
25
(5)
3
2
3
(
x
−
)
−
=
0
5
7
(6)
2
1
(
x
−
1
)
−
=
0
2
(7)
5
2
3
(
x
−
)
−
=
0
7
2
(8)
2
(
x
＋
1
)
−
1
=
0
(9)
2
1
(
x
−
1
)
−
=
0
9
(10)
5
2
9
(
x
＋
)
=
6
25
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
1
2
6
(
x
＋
)
−
3
7
=
0
1
x
＋
3
42
=
±
7
x
1
42
=
−
±
3
7
(2)
1
2
(
x
＋
)
5
4
=
9
1
x
＋
5
2
=
±
3
x
1
2
=
−
±
5
3
x
7
13
=
，
−
15
15
(3)
1
2
(
x
＋
)
5
8
=
7
1
x
＋
5
2
14
=
±
7
x
1
2
14
=
−
±
5
7
(4)
2
2
(
x
＋
)
7
16
=
25
2
x
＋
7
4
=
±
5
x
2
4
=
−
±
7
5
x
18
38
=
，
−
35
35
(5)
3
2
3
(
x
−
)
−
5
7
=
0
3
x
−
5
21
=
±
7
x
3
21
=
±
5
7
(6)
2
1
(
x
−
1
)
−
2
=
0
x
−
1
2
=
±
2
x
2
=
1
±
2
(7)
5
2
3
(
x
−
)
−
7
2
=
0
5
x
−
7
6
=
±
2
x
5
6
=
±
7
2
(8)
2
(
x
＋
1
)
−
1
=
0
x
＋
1
=
±
1
x
=
−
1
±
1
x
=
0
，
−2
(9)
2
1
(
x
−
1
)
−
9
=
0
x
−
1
1
=
±
3
x
1
=
1
±
3
x
4
2
=
，
3
3
(10)
5
2
(
x
＋
)
6
9
=
25
5
x
＋
6
3
=
±
5
x
5
3
=
−
±
6
5
x
7
43
=
−
，
−
30
30