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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
+
1
)
=
2
(
13
x
−
22
)
(2)
(
x
+
9
)
(
x
+
1
)
=
18
x
+
29
(3)
2
x
−
7
x
+
5
=
−8
x
+
61
(4)
2
x
+
2
x
−
6
=
−2
x
+
15
(5)
(
x
+
10
)
(
x
−
8
)
=
2
(
x
−
8
)
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
(
x
+
10
)
(
x
+
1
)
=
2
(
13
x
−
22
)
2
x
+
11
x
+
10
=
26
x
−
44
2
x
−
15
x
+
54
=
0
(
x
−
9
)
(
x
−
6
)
=
0
x
=
9
,
6
(2)
(
x
+
9
)
(
x
+
1
)
=
18
x
+
29
2
x
+
10
x
+
9
=
18
x
+
29
2
x
−
8
x
−
20
=
0
(
x
+
2
)
(
x
−
10
)
=
0
x
=
−2
,
10
(3)
2
x
−
7
x
+
5
=
−8
x
+
61
2
x
+
x
−
56
=
0
(
x
−
7
)
(
x
+
8
)
=
0
x
=
7
,
−8
(4)
2
x
+
2
x
−
6
=
−2
x
+
15
2
x
+
4
x
−
21
=
0
(
x
+
7
)
(
x
−
3
)
=
0
x
=
−7
,
3
(5)
(
x
+
10
)
(
x
−
8
)
=
2
(
x
−
8
)
2
x
+
2
x
−
80
=
2
x
−
16
2
x
−
64
=
0
(
x
−
8
)
(
x
+
8
)
=
0
x
=
8
,
−8