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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
−
10
x
−
2
=
−5
x
+
22
(2)
(
x
+
4
)
(
x
+
5
)
=
2
(
−
x
+
1
)
(3)
2
x
−
10
x
+
5
=
−13
x
+
23
(4)
(
x
+
2
)
(
x
+
7
)
=
4
(
x
+
7
)
(5)
2
x
+
x
−
5
=
−4
x
−
9
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
x
−
10
x
−
2
=
−5
x
+
22
2
x
−
5
x
−
24
=
0
(
x
−
8
)
(
x
+
3
)
=
0
x
=
8
,
−3
(2)
(
x
+
4
)
(
x
+
5
)
=
2
(
−
x
+
1
)
2
x
+
9
x
+
20
=
−2
x
+
2
2
x
+
11
x
+
18
=
0
(
x
+
9
)
(
x
+
2
)
=
0
x
=
−9
,
−2
(3)
2
x
−
10
x
+
5
=
−13
x
+
23
2
x
+
3
x
−
18
=
0
(
x
+
6
)
(
x
−
3
)
=
0
x
=
−6
,
3
(4)
(
x
+
2
)
(
x
+
7
)
=
4
(
x
+
7
)
2
x
+
9
x
+
14
=
4
x
+
28
2
x
+
5
x
−
14
=
0
(
x
+
7
)
(
x
−
2
)
=
0
x
=
−7
,
2
(5)
2
x
+
x
−
5
=
−4
x
−
9
2
x
+
5
x
+
4
=
0
(
x
+
1
)
(
x
+
4
)
=
0
x
=
−1
,
−4