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