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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
4
x
−
20
x
=
0
(2)
2
2
x
+
20
x
=
0
(3)
2
4
x
+
4
x
=
0
(4)
2
3
x
+
24
x
=
0
(5)
2
x
+
8
x
=
0
(6)
2
7
x
=
−
49
x
(7)
2
3
x
+
27
x
=
0
(8)
2
9
x
−
45
x
=
0
(9)
2
3
x
=
5
x
(10)
2
8
x
+
2
x
=
0
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
4
x
−
20
x
=
0
4
x
(
x
−
5
)
=
0
x
=
0
,
5
(2)
2
2
x
+
20
x
=
0
2
x
(
x
+
10
)
=
0
x
=
0
,
−10
(3)
2
4
x
+
4
x
=
0
4
x
(
x
+
1
)
=
0
x
=
0
,
−1
(4)
2
3
x
+
24
x
=
0
3
x
(
x
+
8
)
=
0
x
=
0
,
−8
(5)
2
x
+
8
x
=
0
x
(
x
+
8
)
=
0
x
=
0
,
−8
(6)
2
7
x
=
−
49
x
7
x
(
x
+
7
)
=
0
x
=
0
,
−7
(7)
2
3
x
+
27
x
=
0
3
x
(
x
+
9
)
=
0
x
=
0
,
−9
(8)
2
9
x
−
45
x
=
0
9
x
(
x
−
5
)
=
0
x
=
0
,
5
(9)
2
3
x
=
5
x
5
3
x
(
x
−
)
3
=
0
x
5
=
0
,
3
(10)
2
8
x
+
2
x
=
0
1
8
x
(
x
+
)
4
=
0
x
1
=
0
,
−
4