[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
[220-00]
(1)
2
x
(
x
−
8
)
=
0
(2)
9
x
(
x
+
8
)
=
0
(3)
8
x
(
x
−
2
)
=
0
(4)
10
x
(
x
−
9
)
=
0
(5)
4
x
(
x
+
2
)
=
0
(6)
7
x
(
x
−
6
)
=
0
(7)
−6
x
(
x
+
2
)
=
0
(8)
4
x
(
x
+
5
)
=
0
(9)
−6
x
(
x
+
2
)
=
0
(10)
−5
x
(
x
+
2
)
=
0
(11)
5
x
(
x
+
7
)
=
0
(12)
−4
x
(
x
+
3
)
=
0
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
x
(
x
−
8
)
=
0
x
=
0
,
8
(2)
9
x
(
x
+
8
)
=
0
x
=
0
,
−8
(3)
8
x
(
x
−
2
)
=
0
x
=
0
,
2
(4)
10
x
(
x
−
9
)
=
0
x
=
0
,
9
(5)
4
x
(
x
+
2
)
=
0
x
=
0
,
−2
(6)
7
x
(
x
−
6
)
=
0
x
=
0
,
6
(7)
−6
x
(
x
+
2
)
=
0
x
=
0
,
−2
(8)
4
x
(
x
+
5
)
=
0
x
=
0
,
−5
(9)
−6
x
(
x
+
2
)
=
0
x
=
0
,
−2
(10)
−5
x
(
x
+
2
)
=
0
x
=
0
,
−2
(11)
5
x
(
x
+
7
)
=
0
x
=
0
,
−7
(12)
−4
x
(
x
+
3
)
=
0
x
=
0
,
−3