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©2018 数学クラブ http://sugaku.club/
月 日（ ）
● 次の計算をしましょう
[160-00]
(1)
7
a
×
2
b
(2)
2
−7
x
×
(
−2
)
x
(3)
3
9
p
×
(
−2
)
p
(4)
2
7
a
×
6
a
(5)
2
4
x
×
3
z
(6)
8
p
×
(
−3
)
q
(7)
3
−6
a
×
(
−5
)
b
(8)
2
8
p
×
9
q
(9)
3
8
x
×
(
−7
)
z
(10)
2
3
a
×
3
c
(11)
3
10
u
×
(
−3
)
v
(12)
3
3
x
×
(
−10
)
x
(13)
2
10
a
×
9
b
(14)
8
u
×
(
−5
)
v
(15)
−5
p
×
(
−5
)
r
(16)
2
−8
a
×
7
c
©2018 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
7
a
×
2
b
=
14
a
b
(2)
2
−7
x
×
(
−2
)
x
3
=
14
x
(3)
3
9
p
×
(
−2
)
p
4
=
−18
p
(4)
2
7
a
×
6
a
3
=
42
a
(5)
2
4
x
×
3
z
2
=
12
x
z
(6)
8
p
×
(
−3
)
q
=
−24
p
q
(7)
3
−6
a
×
(
−5
)
b
3
=
30
a
b
(8)
2
8
p
×
9
q
2
=
72
p
q
(9)
3
8
x
×
(
−7
)
z
3
=
−56
x
z
(10)
2
3
a
×
3
c
2
=
9
a
c
(11)
3
10
u
×
(
−3
)
v
3
=
−30
u
v
(12)
3
3
x
×
(
−10
)
x
4
=
−30
x
(13)
2
10
a
×
9
b
2
=
90
a
b
(14)
8
u
×
(
−5
)
v
=
−40
u
v
(15)
−5
p
×
(
−5
)
r
=
25
p
r
(16)
2
−8
a
×
7
c
2
=
−56
a
c