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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
+
10
)
(
x
−
8
)
=
8
(
−
x
−
12
)
(2)
2
x
−
8
x
+
9
=
−5
x
+
37
(3)
(
x
−
4
)
(
x
−
9
)
=
18
(
−
x
+
4
)
(4)
(
x
+
7
)
(
x
+
6
)
=
2
(
x
+
6
)
(5)
2
x
+
3
x
+
9
=
−9
x
−
26
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
(
x
+
10
)
(
x
−
8
)
=
8
(
−
x
−
12
)
2
x
+
2
x
−
80
=
−8
x
−
96
2
x
+
10
x
+
16
=
0
(
x
+
2
)
(
x
+
8
)
=
0
x
=
−2
,
−8
(2)
2
x
−
8
x
+
9
=
−5
x
+
37
2
x
−
3
x
−
28
=
0
(
x
−
7
)
(
x
+
4
)
=
0
x
=
7
,
−4
(3)
(
x
−
4
)
(
x
−
9
)
=
18
(
−
x
+
4
)
2
x
−
13
x
+
36
=
−18
x
+
72
2
x
+
5
x
−
36
=
0
(
x
−
4
)
(
x
+
9
)
=
0
x
=
4
,
−9
(4)
(
x
+
7
)
(
x
+
6
)
=
2
(
x
+
6
)
2
x
+
13
x
+
42
=
2
x
+
12
2
x
+
11
x
+
30
=
0
(
x
+
5
)
(
x
+
6
)
=
0
x
=
−5
,
−6
(5)
2
x
+
3
x
+
9
=
−9
x
−
26
2
x
+
12
x
+
35
=
0
(
x
+
5
)
(
x
+
7
)
=
0
x
=
−5
,
−7