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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
[221-00]
(1)
(
x
−
8
)
(
x
−
10
)
=
0
(2)
(
x
+
4
)
(
x
−
5
)
=
0
(3)
(
x
−
3
)
(
x
+
2
)
=
0
(4)
(
x
−
1
)
(
x
−
6
)
=
0
(5)
(
x
+
7
)
(
x
+
5
)
=
0
(6)
(
x
+
3
)
(
x
+
6
)
=
0
(7)
(
x
−
2
)
(
x
+
3
)
=
0
(8)
(
x
−
3
)
(
x
−
1
)
=
0
(9)
(
x
−
5
)
(
x
+
6
)
=
0
(10)
(
x
+
2
)
(
x
+
1
)
=
0
(11)
(
x
−
6
)
(
x
+
5
)
=
0
(12)
(
x
−
6
)
(
x
+
1
)
=
0
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
(
x
−
8
)
(
x
−
10
)
=
0
x
=
8
,
10
(2)
(
x
+
4
)
(
x
−
5
)
=
0
x
=
−4
,
5
(3)
(
x
−
3
)
(
x
+
2
)
=
0
x
=
3
,
−2
(4)
(
x
−
1
)
(
x
−
6
)
=
0
x
=
1
,
6
(5)
(
x
+
7
)
(
x
+
5
)
=
0
x
=
−7
,
−5
(6)
(
x
+
3
)
(
x
+
6
)
=
0
x
=
−3
,
−6
(7)
(
x
−
2
)
(
x
+
3
)
=
0
x
=
2
,
−3
(8)
(
x
−
3
)
(
x
−
1
)
=
0
x
=
3
,
1
(9)
(
x
−
5
)
(
x
+
6
)
=
0
x
=
5
,
−6
(10)
(
x
+
2
)
(
x
+
1
)
=
0
x
=
−2
,
−1
(11)
(
x
−
6
)
(
x
+
5
)
=
0
x
=
6
,
−5
(12)
(
x
−
6
)
(
x
+
1
)
=
0
x
=
6
,
−1