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