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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)
(
x
−
8
)
(
x
−
2
)
=
−18
x
+
1
(2)
2
x
+
7
x
+
9
=
−5
x
−
26
(3)
(
x
+
10
)
(
x
+
6
)
=
8
x
+
53
(4)
(
x
+
3
)
(
x
−
1
)
=
45
(5)
(
x
+
9
)
(
x
+
4
)
=
8
(
x
+
9
)
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
(
x
−
8
)
(
x
−
2
)
=
−18
x
+
1
2
x
−
10
x
+
16
=
−18
x
+
1
2
x
+
8
x
+
15
=
0
(
x
+
5
)
(
x
+
3
)
=
0
x
=
−5
,
−3
(2)
2
x
+
7
x
+
9
=
−5
x
−
26
2
x
+
12
x
+
35
=
0
(
x
+
5
)
(
x
+
7
)
=
0
x
=
−5
,
−7
(3)
(
x
+
10
)
(
x
+
6
)
=
8
x
+
53
2
x
+
16
x
+
60
=
8
x
+
53
2
x
+
8
x
+
7
=
0
(
x
+
1
)
(
x
+
7
)
=
0
x
=
−1
,
−7
(4)
(
x
+
3
)
(
x
−
1
)
=
45
2
x
+
2
x
−
3
=
45
2
x
+
2
x
−
48
=
0
(
x
−
6
)
(
x
+
8
)
=
0
x
=
6
,
−8
(5)
(
x
+
9
)
(
x
+
4
)
=
8
(
x
+
9
)
2
x
+
13
x
+
36
=
8
x
+
72
2
x
+
5
x
−
36
=
0
(
x
−
4
)
(
x
+
9
)
=
0
x
=
4
,
−9