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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
5
x
+
4
x
=
0
(2)
2
4
x
+
36
x
=
0
(3)
2
x
+
3
x
=
0
(4)
2
5
x
=
−
50
x
(5)
2
7
x
+
70
x
=
0
(6)
2
8
x
=
−
56
x
(7)
2
2
x
=
−
14
x
(8)
2
4
x
−
9
x
=
0
(9)
2
8
x
−
16
x
=
0
(10)
2
3
x
=
−
12
x
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
5
x
+
4
x
=
0
4
5
x
(
x
+
)
5
=
0
x
4
=
0
,
−
5
(2)
2
4
x
+
36
x
=
0
4
x
(
x
+
9
)
=
0
x
=
0
,
−9
(3)
2
x
+
3
x
=
0
x
(
x
+
3
)
=
0
x
=
0
,
−3
(4)
2
5
x
=
−
50
x
5
x
(
x
+
10
)
=
0
x
=
0
,
−10
(5)
2
7
x
+
70
x
=
0
7
x
(
x
+
10
)
=
0
x
=
0
,
−10
(6)
2
8
x
=
−
56
x
8
x
(
x
+
7
)
=
0
x
=
0
,
−7
(7)
2
2
x
=
−
14
x
2
x
(
x
+
7
)
=
0
x
=
0
,
−7
(8)
2
4
x
−
9
x
=
0
9
4
x
(
x
−
)
4
=
0
x
9
=
0
,
4
(9)
2
8
x
−
16
x
=
0
8
x
(
x
−
2
)
=
0
x
=
0
,
2
(10)
2
3
x
=
−
12
x
3
x
(
x
+
4
)
=
0
x
=
0
,
−4