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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
+
15
x
=
0
(3)
2
10
x
+
90
x
=
0
(4)
2
9
x
−
81
x
=
0
(5)
2
10
x
−
7
x
=
0
(6)
2
2
x
−
7
x
=
0
(7)
2
5
x
=
25
x
(8)
2
3
x
=
24
x
(9)
2
9
x
+
27
x
=
0
(10)
2
5
x
−
20
x
=
0
©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
+
15
x
=
0
5
x
(
x
+
3
)
=
0
x
=
0
,
−3
(3)
2
10
x
+
90
x
=
0
10
x
(
x
+
9
)
=
0
x
=
0
,
−9
(4)
2
9
x
−
81
x
=
0
9
x
(
x
−
9
)
=
0
x
=
0
,
9
(5)
2
10
x
−
7
x
=
0
7
10
x
(
x
−
)
10
=
0
x
7
=
0
,
10
(6)
2
2
x
−
7
x
=
0
7
2
x
(
x
−
)
2
=
0
x
7
=
0
,
2
(7)
2
5
x
=
25
x
5
x
(
x
−
5
)
=
0
x
=
0
,
5
(8)
2
3
x
=
24
x
3
x
(
x
−
8
)
=
0
x
=
0
,
8
(9)
2
9
x
+
27
x
=
0
9
x
(
x
+
3
)
=
0
x
=
0
,
−3
(10)
2
5
x
−
20
x
=
0
5
x
(
x
−
4
)
=
0
x
=
0
,
4