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©2024 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
+
7
)
=
0
(2)
x
(
x
+
4
)
=
0
(3)
−3
x
(
x
+
5
)
=
0
(4)
2
x
(
x
−
9
)
=
0
(5)
10
x
(
x
−
5
)
=
0
(6)
10
x
(
x
−
10
)
=
0
(7)
5
x
(
x
+
6
)
=
0
(8)
−
x
(
x
+
6
)
=
0
(9)
−7
x
(
x
+
7
)
=
0
(10)
8
x
(
x
−
10
)
=
0
(11)
x
(
x
+
4
)
=
0
(12)
2
x
(
x
−
2
)
=
0
©2024 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−5
x
(
x
+
7
)
=
0
x
=
0
,
−7
(2)
x
(
x
+
4
)
=
0
x
=
0
,
−4
(3)
−3
x
(
x
+
5
)
=
0
x
=
0
,
−5
(4)
2
x
(
x
−
9
)
=
0
x
=
0
,
9
(5)
10
x
(
x
−
5
)
=
0
x
=
0
,
5
(6)
10
x
(
x
−
10
)
=
0
x
=
0
,
10
(7)
5
x
(
x
+
6
)
=
0
x
=
0
,
−6
(8)
−
x
(
x
+
6
)
=
0
x
=
0
,
−6
(9)
−7
x
(
x
+
7
)
=
0
x
=
0
,
−7
(10)
8
x
(
x
−
10
)
=
0
x
=
0
,
10
(11)
x
(
x
+
4
)
=
0
x
=
0
,
−4
(12)
2
x
(
x
−
2
)
=
0
x
=
0
,
2