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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
+
6
)
(
x
+
10
)
=
2
(
9
x
+
70
)
(2)
2
x
+
6
x
−
4
=
11
x
+
10
(3)
(
x
+
6
)
(
x
+
1
)
=
9
x
+
5
(4)
2
x
+
7
x
−
2
=
9
x
+
46
(5)
2
x
+
x
+
10
=
x
+
74
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
(
x
+
6
)
(
x
+
10
)
=
2
(
9
x
+
70
)
2
x
+
16
x
+
60
=
18
x
+
140
2
x
−
2
x
−
80
=
0
(
x
−
10
)
(
x
+
8
)
=
0
x
=
10
,
−8
(2)
2
x
+
6
x
−
4
=
11
x
+
10
2
x
−
5
x
−
14
=
0
(
x
−
7
)
(
x
+
2
)
=
0
x
=
7
,
−2
(3)
(
x
+
6
)
(
x
+
1
)
=
9
x
+
5
2
x
+
7
x
+
6
=
9
x
+
5
2
x
−
2
x
+
1
=
0
2
(
x
−
1
)
=
0
x
=
1
(4)
2
x
+
7
x
−
2
=
9
x
+
46
2
x
−
2
x
−
48
=
0
(
x
−
8
)
(
x
+
6
)
=
0
x
=
8
,
−6
(5)
2
x
+
x
+
10
=
x
+
74
2
x
−
64
=
0
(
x
+
8
)
(
x
−
8
)
=
0
x
=
−8
,
8