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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
−
3
x
+
1
=
−5
x
+
4
(2)
(
x
+
2
)
(
x
+
10
)
=
7
(
2
x
+
5
)
(3)
(
x
−
2
)
(
x
+
6
)
=
9
(4)
(
x
+
10
)
(
x
+
7
)
=
11
x
+
65
(5)
2
x
+
9
x
−
6
=
25
x
−
66
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
x
−
3
x
+
1
=
−5
x
+
4
2
x
+
2
x
−
3
=
0
(
x
−
1
)
(
x
+
3
)
=
0
x
=
1
,
−3
(2)
(
x
+
2
)
(
x
+
10
)
=
7
(
2
x
+
5
)
2
x
+
12
x
+
20
=
14
x
+
35
2
x
−
2
x
−
15
=
0
(
x
+
3
)
(
x
−
5
)
=
0
x
=
−3
,
5
(3)
(
x
−
2
)
(
x
+
6
)
=
9
2
x
+
4
x
−
12
=
9
2
x
+
4
x
−
21
=
0
(
x
+
7
)
(
x
−
3
)
=
0
x
=
−7
,
3
(4)
(
x
+
10
)
(
x
+
7
)
=
11
x
+
65
2
x
+
17
x
+
70
=
11
x
+
65
2
x
+
6
x
+
5
=
0
(
x
+
1
)
(
x
+
5
)
=
0
x
=
−1
,
−5
(5)
2
x
+
9
x
−
6
=
25
x
−
66
2
x
−
16
x
+
60
=
0
(
x
−
6
)
(
x
−
10
)
=
0
x
=
6
,
10