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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
−
4
)
=
−16
x
+
37
(2)
(
x
+
2
)
(
x
+
7
)
=
13
x
+
59
(3)
(
x
−
7
)
(
x
−
3
)
=
3
(
−7
x
+
1
)
(4)
2
x
+
3
x
+
7
=
7
x
+
12
(5)
2
x
+
6
x
+
4
=
4
(
2
x
+
3
)
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
(
x
−
8
)
(
x
−
4
)
=
−16
x
+
37
2
x
−
12
x
+
32
=
−16
x
+
37
2
x
+
4
x
−
5
=
0
(
x
+
5
)
(
x
−
1
)
=
0
x
=
−5
,
1
(2)
(
x
+
2
)
(
x
+
7
)
=
13
x
+
59
2
x
+
9
x
+
14
=
13
x
+
59
2
x
−
4
x
−
45
=
0
(
x
−
9
)
(
x
+
5
)
=
0
x
=
9
,
−5
(3)
(
x
−
7
)
(
x
−
3
)
=
3
(
−7
x
+
1
)
2
x
−
10
x
+
21
=
−21
x
+
3
2
x
+
11
x
+
18
=
0
(
x
+
9
)
(
x
+
2
)
=
0
x
=
−9
,
−2
(4)
2
x
+
3
x
+
7
=
7
x
+
12
2
x
−
4
x
−
5
=
0
(
x
−
5
)
(
x
+
1
)
=
0
x
=
5
,
−1
(5)
2
x
+
6
x
+
4
=
4
(
2
x
+
3
)
2
x
−
2
x
−
8
=
0
(
x
+
2
)
(
x
−
4
)
=
0
x
=
−2
,
4