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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
+
5
)
(
x
+
10
)
=
3
(
7
x
+
22
)
(2)
2
x
−
10
x
+
9
=
−17
x
+
27
(3)
(
x
−
9
)
(
x
+
4
)
=
9
(
x
−
9
)
(4)
2
x
+
7
x
+
4
=
2
(
−4
x
−
25
)
(5)
2
x
+
6
x
+
9
=
2
(
−5
x
−
27
)
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
(
x
+
5
)
(
x
+
10
)
=
3
(
7
x
+
22
)
2
x
+
15
x
+
50
=
21
x
+
66
2
x
−
6
x
−
16
=
0
(
x
+
2
)
(
x
−
8
)
=
0
x
=
−2
,
8
(2)
2
x
−
10
x
+
9
=
−17
x
+
27
2
x
+
7
x
−
18
=
0
(
x
+
9
)
(
x
−
2
)
=
0
x
=
−9
,
2
(3)
(
x
−
9
)
(
x
+
4
)
=
9
(
x
−
9
)
2
x
−
5
x
−
36
=
9
x
−
81
2
x
−
14
x
+
45
=
0
(
x
−
9
)
(
x
−
5
)
=
0
x
=
9
,
5
(4)
2
x
+
7
x
+
4
=
2
(
−4
x
−
25
)
2
x
+
15
x
+
54
=
0
(
x
+
9
)
(
x
+
6
)
=
0
x
=
−9
,
−6
(5)
2
x
+
6
x
+
9
=
2
(
−5
x
−
27
)
2
x
+
16
x
+
63
=
0
(
x
+
7
)
(
x
+
9
)
=
0
x
=
−7
,
−9