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