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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
[220-00]
(1)
−4
x
(
x
−
10
)
=
0
(2)
−7
x
(
x
+
4
)
=
0
(3)
6
x
(
x
+
7
)
=
0
(4)
9
x
(
x
+
7
)
=
0
(5)
−8
x
(
x
+
4
)
=
0
(6)
3
x
(
x
+
2
)
=
0
(7)
8
x
(
x
−
10
)
=
0
(8)
−4
x
(
x
−
1
)
=
0
(9)
−4
x
(
x
+
2
)
=
0
(10)
6
x
(
x
−
10
)
=
0
(11)
5
x
(
x
−
3
)
=
0
(12)
3
x
(
x
−
1
)
=
0
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−4
x
(
x
−
10
)
=
0
x
=
0
,
10
(2)
−7
x
(
x
+
4
)
=
0
x
=
0
,
−4
(3)
6
x
(
x
+
7
)
=
0
x
=
0
,
−7
(4)
9
x
(
x
+
7
)
=
0
x
=
0
,
−7
(5)
−8
x
(
x
+
4
)
=
0
x
=
0
,
−4
(6)
3
x
(
x
+
2
)
=
0
x
=
0
,
−2
(7)
8
x
(
x
−
10
)
=
0
x
=
0
,
10
(8)
−4
x
(
x
−
1
)
=
0
x
=
0
,
1
(9)
−4
x
(
x
+
2
)
=
0
x
=
0
,
−2
(10)
6
x
(
x
−
10
)
=
0
x
=
0
,
10
(11)
5
x
(
x
−
3
)
=
0
x
=
0
,
3
(12)
3
x
(
x
−
1
)
=
0
x
=
0
,
1