[文字サイズの変更]
▼
▲
©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の方程式を解きなさい
[220-00]
(1)
5
x
(
x
−
4
)
=
0
(2)
2
x
(
x
+
10
)
=
0
(3)
−2
x
(
x
−
1
)
=
0
(4)
−9
x
(
x
−
3
)
=
0
(5)
8
x
(
x
+
8
)
=
0
(6)
−9
x
(
x
+
1
)
=
0
(7)
6
x
(
x
+
5
)
=
0
(8)
−6
x
(
x
−
3
)
=
0
(9)
4
x
(
x
+
9
)
=
0
(10)
−7
x
(
x
−
9
)
=
0
(11)
5
x
(
x
−
8
)
=
0
(12)
−4
x
(
x
+
2
)
=
0
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
5
x
(
x
−
4
)
=
0
x
=
0
,
4
(2)
2
x
(
x
+
10
)
=
0
x
=
0
,
−10
(3)
−2
x
(
x
−
1
)
=
0
x
=
0
,
1
(4)
−9
x
(
x
−
3
)
=
0
x
=
0
,
3
(5)
8
x
(
x
+
8
)
=
0
x
=
0
,
−8
(6)
−9
x
(
x
+
1
)
=
0
x
=
0
,
−1
(7)
6
x
(
x
+
5
)
=
0
x
=
0
,
−5
(8)
−6
x
(
x
−
3
)
=
0
x
=
0
,
3
(9)
4
x
(
x
+
9
)
=
0
x
=
0
,
−9
(10)
−7
x
(
x
−
9
)
=
0
x
=
0
,
9
(11)
5
x
(
x
−
8
)
=
0
x
=
0
,
8
(12)
−4
x
(
x
+
2
)
=
0
x
=
0
,
−2