［文字サイズの変更］
▼
▲
©2026 数学クラブ http://sugaku.club/
月 日（ ）
● 次の計算をしましょう
[161-00]
(1)
2
−4
x
y
×
(
−8
)
y
(2)
2
3
−7
x
×
(
−2
)
x
(3)
2
2
−5
a
×
(
−5
)
a
(4)
3
2
9
a
b
×
(
−8
)
a
(5)
3
2
3
u
×
(
−6
)
u
(6)
3
2
2
7
x
y
×
(
−3
)
x
(7)
3
3
3
5
u
v
×
(
−4
)
u
v
(8)
2
3
−4
p
×
(
−7
)
p
(9)
2
−9
a
b
×
6
a
(10)
3
2
3
−5
x
y
×
6
y
(11)
3
3
3
a
b
×
10
a
(12)
3
2
−4
a
×
(
−6
)
a
(13)
2
2
−3
x
×
(
−9
)
x
(14)
3
−4
a
b
×
(
−4
)
b
(15)
3
3
5
a
×
(
−8
)
a
(16)
2
−9
p
×
(
−8
)
p
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
−4
x
y
×
(
−8
)
y
2
3
=
−4
x
y
×
(
−8
)
y
=
32
x
y
(2)
2
3
−7
x
×
(
−2
)
x
2
3
5
=
−7
x
×
(
−2
)
x
=
14
x
(3)
2
2
−5
a
×
(
−5
)
a
2
2
4
=
−5
a
×
(
−5
)
a
=
25
a
(4)
3
2
9
a
b
×
(
−8
)
a
3
2
3
3
=
9
a
b
×
(
−8
)
a
=
−72
a
b
(5)
3
2
3
u
×
(
−6
)
u
3
2
5
=
3
u
×
(
−6
)
u
=
−18
u
(6)
3
2
2
7
x
y
×
(
−3
)
x
3
2
2
5
2
=
7
x
y
×
(
−3
)
x
=
−21
x
y
(7)
3
3
3
5
u
v
×
(
−4
)
u
v
3
3
3
6
4
=
5
u
v
×
(
−4
)
u
v
=
−20
u
v
(8)
2
3
−4
p
×
(
−7
)
p
2
3
5
=
−4
p
×
(
−7
)
p
=
28
p
(9)
2
−9
a
b
×
6
a
2
3
=
−9
a
b
×
6
a
=
−54
a
b
(10)
3
2
3
−5
x
y
×
6
y
3
2
3
3
5
=
−5
x
y
×
6
y
=
−30
x
y
(11)
3
3
3
a
b
×
10
a
3
3
6
=
3
a
b
×
10
a
=
30
a
b
(12)
3
2
−4
a
×
(
−6
)
a
3
2
5
=
−4
a
×
(
−6
)
a
=
24
a
(13)
2
2
−3
x
×
(
−9
)
x
2
2
4
=
−3
x
×
(
−9
)
x
=
27
x
(14)
3
−4
a
b
×
(
−4
)
b
3
4
=
−4
a
b
×
(
−4
)
b
=
16
a
b
(15)
3
3
5
a
×
(
−8
)
a
3
3
6
=
5
a
×
(
−8
)
a
=
−40
a
(16)
2
−9
p
×
(
−8
)
p
2
3
=
−9
p
×
(
−8
)
p
=
72
p