[文字サイズの変更]
▼
▲
©2026 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
−
30
x
=
0
(2)
2
7
x
+
28
x
=
0
(3)
2
5
x
−
50
x
=
0
(4)
2
10
x
−
40
x
=
0
(5)
2
9
x
−
8
x
=
0
(6)
2
4
x
+
24
x
=
0
(7)
2
3
x
+
12
x
=
0
(8)
2
7
x
−
10
x
=
0
(9)
2
4
x
+
20
x
=
0
(10)
2
8
x
+
40
x
=
0
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
6
x
−
30
x
=
0
6
x
(
x
−
5
)
=
0
x
=
0
,
5
(2)
2
7
x
+
28
x
=
0
7
x
(
x
+
4
)
=
0
x
=
0
,
−4
(3)
2
5
x
−
50
x
=
0
5
x
(
x
−
10
)
=
0
x
=
0
,
10
(4)
2
10
x
−
40
x
=
0
10
x
(
x
−
4
)
=
0
x
=
0
,
4
(5)
2
9
x
−
8
x
=
0
8
9
x
(
x
−
)
9
=
0
x
8
=
0
,
9
(6)
2
4
x
+
24
x
=
0
4
x
(
x
+
6
)
=
0
x
=
0
,
−6
(7)
2
3
x
+
12
x
=
0
3
x
(
x
+
4
)
=
0
x
=
0
,
−4
(8)
2
7
x
−
10
x
=
0
10
7
x
(
x
−
)
7
=
0
x
10
=
0
,
7
(9)
2
4
x
+
20
x
=
0
4
x
(
x
+
5
)
=
0
x
=
0
,
−5
(10)
2
8
x
+
40
x
=
0
8
x
(
x
+
5
)
=
0
x
=
0
,
−5