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©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の方程式を解きなさい
[226-00]
(1)
2
9
(
x
+
3
)
(
x
+
7
)
=
6
x
+
69
x
+
213
(2)
2
7
(
x
+
10
)
(
x
+
9
)
=
5
x
+
125
x
+
624
(3)
2
4
(
x
+
4
)
(
x
+
2
)
=
2
x
+
24
x
+
82
(4)
2
8
(
x
+
2
)
(
x
−
4
)
=
6
x
−
30
x
−
48
(5)
2
(
x
+
3
)
(
x
+
7
)
=
−
x
+
18
x
+
15
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
9
(
x
+
3
)
(
x
+
7
)
2
=
6
x
+
69
x
+
213
2
9
x
+
90
x
+
189
2
=
6
x
+
69
x
+
213
2
3
x
+
21
x
−
24
=
0
3
(
x
+
8
)
(
x
−
1
)
=
0
x
=
−8
,
1
(2)
7
(
x
+
10
)
(
x
+
9
)
2
=
5
x
+
125
x
+
624
2
7
x
+
133
x
+
630
2
=
5
x
+
125
x
+
624
2
2
x
+
8
x
+
6
=
0
2
(
x
+
1
)
(
x
+
3
)
=
0
x
=
−1
,
−3
(3)
4
(
x
+
4
)
(
x
+
2
)
2
=
2
x
+
24
x
+
82
2
4
x
+
24
x
+
32
2
=
2
x
+
24
x
+
82
2
2
x
−
50
=
0
2
(
x
+
5
)
(
x
−
5
)
=
0
x
=
−5
,
5
(4)
8
(
x
+
2
)
(
x
−
4
)
2
=
6
x
−
30
x
−
48
2
8
x
−
16
x
−
64
2
=
6
x
−
30
x
−
48
2
2
x
+
14
x
−
16
=
0
2
(
x
−
1
)
(
x
+
8
)
=
0
x
=
1
,
−8
(5)
(
x
+
3
)
(
x
+
7
)
2
=
−
x
+
18
x
+
15
2
x
+
10
x
+
21
2
=
−
x
+
18
x
+
15
2
2
x
−
8
x
+
6
=
0
2
(
x
−
3
)
(
x
−
1
)
=
0
x
=
3
,
1