［文字サイズの変更］
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©2025 数学クラブ http://sugaku.club/
月 日（ ）
● 次の計算をしましょう
[161-00]
(1)
3
2
8
x
×
3
x
(2)
2
3
a
b
×
4
b
(3)
3
2
−3
x
y
×
(
−7
)
x
y
(4)
2
2
2
x
y
×
9
x
y
(5)
3
−3
a
×
7
a
(6)
2
−5
a
b
×
9
b
(7)
3
2
2
u
×
9
u
(8)
2
2
x
×
3
x
(9)
3
3
u
v
×
(
−10
)
u
(10)
−8
p
q
×
(
−8
)
p
(11)
2
3
8
u
×
9
u
(12)
2
−8
u
×
3
u
(13)
2
3
2
−4
a
b
×
10
a
b
(14)
2
3
9
p
×
5
p
(15)
2
3
4
a
×
(
−2
)
a
(16)
3
3
6
u
×
(
−2
)
u
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
3
2
8
x
×
3
x
3
2
5
=
8
x
×
3
x
=
24
x
(2)
2
3
a
b
×
4
b
2
3
=
3
a
b
×
4
b
=
12
a
b
(3)
3
2
−3
x
y
×
(
−7
)
x
y
3
2
5
2
=
−3
x
y
×
(
−7
)
x
y
=
21
x
y
(4)
2
2
2
x
y
×
9
x
y
2
2
4
2
=
2
x
y
×
9
x
y
=
18
x
y
(5)
3
−3
a
×
7
a
3
4
=
−3
a
×
7
a
=
−21
a
(6)
2
−5
a
b
×
9
b
2
3
=
−5
a
b
×
9
b
=
−45
a
b
(7)
3
2
2
u
×
9
u
3
2
5
=
2
u
×
9
u
=
18
u
(8)
2
2
x
×
3
x
2
3
=
2
x
×
3
x
=
6
x
(9)
3
3
u
v
×
(
−10
)
u
3
4
=
3
u
v
×
(
−10
)
u
=
−30
u
v
(10)
−8
p
q
×
(
−8
)
p
2
=
−8
p
q
×
(
−8
)
p
=
64
p
q
(11)
2
3
8
u
×
9
u
2
3
5
=
8
u
×
9
u
=
72
u
(12)
2
−8
u
×
3
u
2
3
=
−8
u
×
3
u
=
−24
u
(13)
2
3
2
−4
a
b
×
10
a
b
2
3
2
4
4
=
−4
a
b
×
10
a
b
=
−40
a
b
(14)
2
3
9
p
×
5
p
2
3
5
=
9
p
×
5
p
=
45
p
(15)
2
3
4
a
×
(
−2
)
a
2
3
5
=
4
a
×
(
−2
)
a
=
−8
a
(16)
3
3
6
u
×
(
−2
)
u
3
3
6
=
6
u
×
(
−2
)
u
=
−12
u