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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
+
4
)
=
13
x
+
112
(2)
2
x
+
5
x
+
8
=
2
(
8
x
−
11
)
(3)
2
x
−
8
x
+
4
=
−14
x
+
11
(4)
(
x
−
9
)
(
x
+
3
)
=
−16
x
−
51
(5)
2
x
+
10
x
−
10
=
9
x
+
62
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
(
x
+
10
)
(
x
+
4
)
=
13
x
+
112
2
x
+
14
x
+
40
=
13
x
+
112
2
x
+
x
−
72
=
0
(
x
−
8
)
(
x
+
9
)
=
0
x
=
8
,
−9
(2)
2
x
+
5
x
+
8
=
2
(
8
x
−
11
)
2
x
−
11
x
+
30
=
0
(
x
−
5
)
(
x
−
6
)
=
0
x
=
5
,
6
(3)
2
x
−
8
x
+
4
=
−14
x
+
11
2
x
+
6
x
−
7
=
0
(
x
+
7
)
(
x
−
1
)
=
0
x
=
−7
,
1
(4)
(
x
−
9
)
(
x
+
3
)
=
−16
x
−
51
2
x
−
6
x
−
27
=
−16
x
−
51
2
x
+
10
x
+
24
=
0
(
x
+
4
)
(
x
+
6
)
=
0
x
=
−4
,
−6
(5)
2
x
+
10
x
−
10
=
9
x
+
62
2
x
+
x
−
72
=
0
(
x
−
8
)
(
x
+
9
)
=
0
x
=
8
,
−9