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©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
2
5
u
×
7
u
(2)
2
2
x
×
(
−5
)
x
(3)
3
5
a
×
7
a
(4)
3
3
2
−7
x
y
×
5
y
(5)
3
3
u
v
×
3
v
w
(6)
2
−10
p
q
×
(
−10
)
p
(7)
3
2
−4
u
×
(
−8
)
u
(8)
2
7
a
b
×
(
−10
)
a
(9)
3
3
−2
x
×
4
x
(10)
2
2
4
x
×
(
−9
)
x
(11)
10
a
b
×
(
−7
)
b
(12)
2
3
10
p
×
(
−3
)
p
(13)
3
2
3
−10
a
b
×
6
b
(14)
2
3
8
a
×
6
a
(15)
3
2
−6
u
×
(
−8
)
u
(16)
2
3
2
7
x
y
×
(
−3
)
x
y
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
2
5
u
×
7
u
2
2
4
=
5
u
×
7
u
=
35
u
(2)
2
2
x
×
(
−5
)
x
2
3
=
2
x
×
(
−5
)
x
=
−10
x
(3)
3
5
a
×
7
a
3
4
=
5
a
×
7
a
=
35
a
(4)
3
3
2
−7
x
y
×
5
y
3
3
2
3
5
=
−7
x
y
×
5
y
=
−35
x
y
(5)
3
3
u
v
×
3
v
w
3
4
=
3
u
v
×
3
v
w
=
9
u
v
w
(6)
2
−10
p
q
×
(
−10
)
p
2
2
2
=
−10
p
q
×
(
−10
)
p
=
100
p
q
(7)
3
2
−4
u
×
(
−8
)
u
3
2
5
=
−4
u
×
(
−8
)
u
=
32
u
(8)
2
7
a
b
×
(
−10
)
a
2
3
=
7
a
b
×
(
−10
)
a
=
−70
a
b
(9)
3
3
−2
x
×
4
x
3
3
6
=
−2
x
×
4
x
=
−8
x
(10)
2
2
4
x
×
(
−9
)
x
2
2
4
=
4
x
×
(
−9
)
x
=
−36
x
(11)
10
a
b
×
(
−7
)
b
2
=
10
a
b
×
(
−7
)
b
=
−70
a
b
(12)
2
3
10
p
×
(
−3
)
p
2
3
5
=
10
p
×
(
−3
)
p
=
−30
p
(13)
3
2
3
−10
a
b
×
6
b
3
2
3
3
5
=
−10
a
b
×
6
b
=
−60
a
b
(14)
2
3
8
a
×
6
a
2
3
5
=
8
a
×
6
a
=
48
a
(15)
3
2
−6
u
×
(
−8
)
u
3
2
5
=
−6
u
×
(
−8
)
u
=
48
u
(16)
2
3
2
7
x
y
×
(
−3
)
x
y
2
3
2
4
4
=
7
x
y
×
(
−3
)
x
y
=
−21
x
y