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©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の式を因数分解しなさい
[1B0-00]
(1)
2
10
a
+
2
a
(2)
2
6
u
+
2
u
(3)
2
9
u
+
3
u
(4)
2
5
a
−
2
a
(5)
2
9
u
−
9
u
(6)
2
7
x
−
3
x
(7)
2
9
x
+
4
x
(8)
2
8
a
+
2
a
(9)
2
10
u
+
2
u
(10)
2
6
u
+
10
u
(11)
2
4
p
+
4
p
(12)
2
6
x
−
x
(13)
2
7
x
−
7
x
(14)
2
p
−
9
p
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
10
a
+
2
a
=
2
a
(
5
a
+
1
)
(2)
2
6
u
+
2
u
=
2
u
(
3
u
+
1
)
(3)
2
9
u
+
3
u
=
3
u
(
3
u
+
1
)
(4)
2
5
a
−
2
a
=
a
(
5
a
−
2
)
(5)
2
9
u
−
9
u
=
9
u
(
u
−
1
)
(6)
2
7
x
−
3
x
=
x
(
7
x
−
3
)
(7)
2
9
x
+
4
x
=
x
(
9
x
+
4
)
(8)
2
8
a
+
2
a
=
2
a
(
4
a
+
1
)
(9)
2
10
u
+
2
u
=
2
u
(
5
u
+
1
)
(10)
2
6
u
+
10
u
=
2
u
(
3
u
+
5
)
(11)
2
4
p
+
4
p
=
4
p
(
p
+
1
)
(12)
2
6
x
−
x
=
x
(
6
x
−
1
)
(13)
2
7
x
−
7
x
=
7
x
(
x
−
1
)
(14)
2
p
−
9
p
=
p
(
p
−
9
)