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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
x
+
7
x
(2)
2
10
u
−
2
u
(3)
2
7
a
−
a
(4)
2
p
+
9
p
(5)
2
5
x
−
7
x
(6)
2
10
a
−
3
a
(7)
2
3
u
+
8
u
(8)
2
10
a
+
4
a
(9)
2
4
a
+
9
a
(10)
2
8
a
+
5
a
(11)
2
4
p
+
3
p
(12)
2
2
a
+
3
a
(13)
2
4
x
+
10
x
(14)
2
6
u
+
2
u
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
10
x
+
7
x
=
x
(
10
x
+
7
)
(2)
2
10
u
−
2
u
=
2
u
(
5
u
−
1
)
(3)
2
7
a
−
a
=
a
(
7
a
−
1
)
(4)
2
p
+
9
p
=
p
(
p
+
9
)
(5)
2
5
x
−
7
x
=
x
(
5
x
−
7
)
(6)
2
10
a
−
3
a
=
a
(
10
a
−
3
)
(7)
2
3
u
+
8
u
=
u
(
3
u
+
8
)
(8)
2
10
a
+
4
a
=
2
a
(
5
a
+
2
)
(9)
2
4
a
+
9
a
=
a
(
4
a
+
9
)
(10)
2
8
a
+
5
a
=
a
(
8
a
+
5
)
(11)
2
4
p
+
3
p
=
p
(
4
p
+
3
)
(12)
2
2
a
+
3
a
=
a
(
2
a
+
3
)
(13)
2
4
x
+
10
x
=
2
x
(
2
x
+
5
)
(14)
2
6
u
+
2
u
=
2
u
(
3
u
+
1
)