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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
[225-00]
(1)
2
x
+
6
x
−
1
=
3
(
−2
x
−
11
)
(2)
(
x
−
1
)
(
x
+
9
)
=
2
(
7
x
+
9
)
(3)
2
x
+
3
x
−
7
=
2
x
+
13
(4)
2
x
+
9
x
−
1
=
8
x
+
41
(5)
(
x
−
5
)
(
x
−
5
)
=
2
(
−7
x
+
11
)
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
x
+
6
x
−
1
=
3
(
−2
x
−
11
)
2
x
+
12
x
+
32
=
0
(
x
+
4
)
(
x
+
8
)
=
0
x
=
−4
,
−8
(2)
(
x
−
1
)
(
x
+
9
)
=
2
(
7
x
+
9
)
2
x
+
8
x
−
9
=
14
x
+
18
2
x
−
6
x
−
27
=
0
(
x
−
9
)
(
x
+
3
)
=
0
x
=
9
,
−3
(3)
2
x
+
3
x
−
7
=
2
x
+
13
2
x
+
x
−
20
=
0
(
x
+
5
)
(
x
−
4
)
=
0
x
=
−5
,
4
(4)
2
x
+
9
x
−
1
=
8
x
+
41
2
x
+
x
−
42
=
0
(
x
−
6
)
(
x
+
7
)
=
0
x
=
6
,
−7
(5)
(
x
−
5
)
(
x
−
5
)
=
2
(
−7
x
+
11
)
2
x
−
10
x
+
25
=
−14
x
+
22
2
x
+
4
x
+
3
=
0
(
x
+
3
)
(
x
+
1
)
=
0
x
=
−3
,
−1