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