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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
[225-00]
(1)
(
x
+
5
)
(
x
+
1
)
=
3
(
4
x
+
15
)
(2)
(
x
+
7
)
(
x
+
9
)
=
15
x
+
83
(3)
2
x
+
2
x
+
2
=
2
(
7
x
−
9
)
(4)
(
x
+
1
)
(
x
+
10
)
=
10
(
2
x
−
1
)
(5)
(
x
+
8
)
(
x
−
6
)
=
−12
x
−
97
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
(
x
+
5
)
(
x
+
1
)
=
3
(
4
x
+
15
)
2
x
+
6
x
+
5
=
12
x
+
45
2
x
−
6
x
−
40
=
0
(
x
−
10
)
(
x
+
4
)
=
0
x
=
10
,
−4
(2)
(
x
+
7
)
(
x
+
9
)
=
15
x
+
83
2
x
+
16
x
+
63
=
15
x
+
83
2
x
+
x
−
20
=
0
(
x
+
5
)
(
x
−
4
)
=
0
x
=
−5
,
4
(3)
2
x
+
2
x
+
2
=
2
(
7
x
−
9
)
2
x
−
12
x
+
20
=
0
(
x
−
10
)
(
x
−
2
)
=
0
x
=
10
,
2
(4)
(
x
+
1
)
(
x
+
10
)
=
10
(
2
x
−
1
)
2
x
+
11
x
+
10
=
20
x
−
10
2
x
−
9
x
+
20
=
0
(
x
−
5
)
(
x
−
4
)
=
0
x
=
5
,
4
(5)
(
x
+
8
)
(
x
−
6
)
=
−12
x
−
97
2
x
+
2
x
−
48
=
−12
x
−
97
2
x
+
14
x
+
49
=
0
2
(
x
+
7
)
=
0
x
=
−7