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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)
2
x
+
x
−
4
=
2
(
−7
x
−
27
)
(2)
2
x
−
3
x
−
6
=
3
(
5
x
−
29
)
(3)
2
x
+
7
x
+
2
=
2
(
x
+
8
)
(4)
(
x
+
10
)
(
x
+
6
)
=
2
(
−
x
−
10
)
(5)
2
x
+
2
x
+
1
=
x
+
91
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
x
+
x
−
4
=
2
(
−7
x
−
27
)
2
x
+
15
x
+
50
=
0
(
x
+
5
)
(
x
+
10
)
=
0
x
=
−5
,
−10
(2)
2
x
−
3
x
−
6
=
3
(
5
x
−
29
)
2
x
−
18
x
+
81
=
0
2
(
x
−
9
)
=
0
x
=
9
(3)
2
x
+
7
x
+
2
=
2
(
x
+
8
)
2
x
+
5
x
−
14
=
0
(
x
−
2
)
(
x
+
7
)
=
0
x
=
2
,
−7
(4)
(
x
+
10
)
(
x
+
6
)
=
2
(
−
x
−
10
)
2
x
+
16
x
+
60
=
−2
x
−
20
2
x
+
18
x
+
80
=
0
(
x
+
10
)
(
x
+
8
)
=
0
x
=
−10
,
−8
(5)
2
x
+
2
x
+
1
=
x
+
91
2
x
+
x
−
90
=
0
(
x
−
9
)
(
x
+
10
)
=
0
x
=
9
,
−10