［文字サイズの変更］
▼
▲
©2019 数学クラブ http://sugaku.club/
月 日（ ）
● 次の計算をしましょう
[161-00]
(1)
2
−2
x
×
(
−7
)
x
(2)
2
−4
a
×
7
a
(3)
2
2
−2
x
y
×
(
−2
)
x
(4)
3
2
−9
x
y
×
(
−2
)
y
(5)
2
8
x
×
(
−8
)
x
(6)
3
3
−8
a
b
×
7
a
(7)
2
2
8
p
×
6
p
(8)
3
10
x
×
4
x
(9)
3
2
−5
u
×
(
−6
)
u
(10)
2
3
4
x
×
(
−6
)
x
(11)
2
8
u
×
10
u
(12)
2
2
10
x
×
(
−2
)
x
(13)
2
−2
p
q
×
(
−7
)
q
r
(14)
2
−2
p
q
×
8
p
(15)
3
2
−10
x
y
×
(
−5
)
x
y
(16)
3
3
−2
u
v
×
7
u
©2019 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
−2
x
×
(
−7
)
x
2
3
=
−2
x
×
(
−7
)
x
=
14
x
(2)
2
−4
a
×
7
a
2
3
=
−4
a
×
7
a
=
−28
a
(3)
2
2
−2
x
y
×
(
−2
)
x
2
2
3
2
=
−2
x
y
×
(
−2
)
x
=
4
x
y
(4)
3
2
−9
x
y
×
(
−2
)
y
3
2
5
=
−9
x
y
×
(
−2
)
y
=
18
x
y
(5)
2
8
x
×
(
−8
)
x
2
3
=
8
x
×
(
−8
)
x
=
−64
x
(6)
3
3
−8
a
b
×
7
a
3
3
4
3
=
−8
a
b
×
7
a
=
−56
a
b
(7)
2
2
8
p
×
6
p
2
2
4
=
8
p
×
6
p
=
48
p
(8)
3
10
x
×
4
x
3
4
=
10
x
×
4
x
=
40
x
(9)
3
2
−5
u
×
(
−6
)
u
3
2
5
=
−5
u
×
(
−6
)
u
=
30
u
(10)
2
3
4
x
×
(
−6
)
x
2
3
5
=
4
x
×
(
−6
)
x
=
−24
x
(11)
2
8
u
×
10
u
2
3
=
8
u
×
10
u
=
80
u
(12)
2
2
10
x
×
(
−2
)
x
2
2
4
=
10
x
×
(
−2
)
x
=
−20
x
(13)
2
−2
p
q
×
(
−7
)
q
r
2
3
=
−2
p
q
×
(
−7
)
q
r
=
14
p
q
r
(14)
2
−2
p
q
×
8
p
2
3
=
−2
p
q
×
8
p
=
−16
p
q
(15)
3
2
−10
x
y
×
(
−5
)
x
y
3
2
3
4
=
−10
x
y
×
(
−5
)
x
y
=
50
x
y
(16)
3
3
−2
u
v
×
7
u
3
3
4
3
=
−2
u
v
×
7
u
=
−14
u
v