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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
[222-00]
(1)
2
6
x
+
24
x
=
0
(2)
2
5
x
+
25
x
=
0
(3)
2
x
=
−
10
x
(4)
2
7
x
−
56
x
=
0
(5)
2
7
x
+
4
x
=
0
(6)
2
4
x
+
12
x
=
0
(7)
2
8
x
=
72
x
(8)
2
6
x
+
30
x
=
0
(9)
2
5
x
+
40
x
=
0
(10)
2
3
x
=
−
15
x
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
6
x
+
24
x
=
0
6
x
(
x
+
4
)
=
0
x
=
0
,
−4
(2)
2
5
x
+
25
x
=
0
5
x
(
x
+
5
)
=
0
x
=
0
,
−5
(3)
2
x
=
−
10
x
x
(
x
+
10
)
=
0
x
=
0
,
−10
(4)
2
7
x
−
56
x
=
0
7
x
(
x
−
8
)
=
0
x
=
0
,
8
(5)
2
7
x
+
4
x
=
0
4
7
x
(
x
+
)
7
=
0
x
4
=
0
,
−
7
(6)
2
4
x
+
12
x
=
0
4
x
(
x
+
3
)
=
0
x
=
0
,
−3
(7)
2
8
x
=
72
x
8
x
(
x
−
9
)
=
0
x
=
0
,
9
(8)
2
6
x
+
30
x
=
0
6
x
(
x
+
5
)
=
0
x
=
0
,
−5
(9)
2
5
x
+
40
x
=
0
5
x
(
x
+
8
)
=
0
x
=
0
,
−8
(10)
2
3
x
=
−
15
x
3
x
(
x
+
5
)
=
0
x
=
0
,
−5