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