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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
+
1
)
(
x
+
3
)
=
7
(
−
x
−
1
)
(2)
(
x
+
5
)
(
x
+
5
)
=
14
x
+
57
(3)
(
x
−
8
)
(
x
+
9
)
=
2
(
−4
x
−
31
)
(4)
2
x
+
10
x
+
4
=
−
12
(5)
(
x
+
8
)
(
x
+
7
)
=
13
x
+
136
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
(
x
+
1
)
(
x
+
3
)
=
7
(
−
x
−
1
)
2
x
+
4
x
+
3
=
−7
x
−
7
2
x
+
11
x
+
10
=
0
(
x
+
10
)
(
x
+
1
)
=
0
x
=
−10
,
−1
(2)
(
x
+
5
)
(
x
+
5
)
=
14
x
+
57
2
x
+
10
x
+
25
=
14
x
+
57
2
x
−
4
x
−
32
=
0
(
x
+
4
)
(
x
−
8
)
=
0
x
=
−4
,
8
(3)
(
x
−
8
)
(
x
+
9
)
=
2
(
−4
x
−
31
)
2
x
+
x
−
72
=
−8
x
−
62
2
x
+
9
x
−
10
=
0
(
x
+
10
)
(
x
−
1
)
=
0
x
=
−10
,
1
(4)
2
x
+
10
x
+
4
=
−
12
2
x
+
10
x
+
16
=
0
(
x
+
2
)
(
x
+
8
)
=
0
x
=
−2
,
−8
(5)
(
x
+
8
)
(
x
+
7
)
=
13
x
+
136
2
x
+
15
x
+
56
=
13
x
+
136
2
x
+
2
x
−
80
=
0
(
x
+
10
)
(
x
−
8
)
=
0
x
=
−10
,
8