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©2026 数学クラブ http://sugaku.club/
月 日（ ）
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[161-00]
(1)
2
2
8
x
y
×
(
−2
)
x
(2)
2
2
4
x
y
×
6
x
(3)
2
3
a
×
(
−10
)
a
(4)
3
9
p
×
2
p
(5)
2
2
−6
x
y
×
(
−2
)
y
(6)
2
2
3
u
v
×
9
v
(7)
3
3
5
p
q
×
(
−6
)
p
q
(8)
3
3
3
u
×
(
−10
)
u
(9)
2
3
8
a
b
×
(
−2
)
a
(10)
3
−3
p
×
(
−9
)
p
(11)
2
3
10
u
×
(
−10
)
u
(12)
2
3
−8
p
×
7
p
(13)
2
3
9
p
×
5
p
(14)
2
2
−2
x
y
×
(
−9
)
x
y
(15)
2
2
−7
u
×
(
−6
)
u
(16)
3
2
6
u
v
×
10
u
v
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
2
8
x
y
×
(
−2
)
x
2
2
4
=
8
x
y
×
(
−2
)
x
=
−16
x
y
(2)
2
2
4
x
y
×
6
x
2
2
3
2
=
4
x
y
×
6
x
=
24
x
y
(3)
2
3
a
×
(
−10
)
a
2
3
=
3
a
×
(
−10
)
a
=
−30
a
(4)
3
9
p
×
2
p
3
4
=
9
p
×
2
p
=
18
p
(5)
2
2
−6
x
y
×
(
−2
)
y
2
2
2
3
=
−6
x
y
×
(
−2
)
y
=
12
x
y
(6)
2
2
3
u
v
×
9
v
2
2
2
3
=
3
u
v
×
9
v
=
27
u
v
(7)
3
3
5
p
q
×
(
−6
)
p
q
3
3
4
4
=
5
p
q
×
(
−6
)
p
q
=
−30
p
q
(8)
3
3
3
u
×
(
−10
)
u
3
3
6
=
3
u
×
(
−10
)
u
=
−30
u
(9)
2
3
8
a
b
×
(
−2
)
a
2
3
5
=
8
a
b
×
(
−2
)
a
=
−16
a
b
(10)
3
−3
p
×
(
−9
)
p
3
4
=
−3
p
×
(
−9
)
p
=
27
p
(11)
2
3
10
u
×
(
−10
)
u
2
3
5
=
10
u
×
(
−10
)
u
=
−100
u
(12)
2
3
−8
p
×
7
p
2
3
5
=
−8
p
×
7
p
=
−56
p
(13)
2
3
9
p
×
5
p
2
3
5
=
9
p
×
5
p
=
45
p
(14)
2
2
−2
x
y
×
(
−9
)
x
y
2
2
3
3
=
−2
x
y
×
(
−9
)
x
y
=
18
x
y
(15)
2
2
−7
u
×
(
−6
)
u
2
2
4
=
−7
u
×
(
−6
)
u
=
42
u
(16)
3
2
6
u
v
×
10
u
v
3
2
3
4
=
6
u
v
×
10
u
v
=
60
u
v