［文字サイズの変更］
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©2025 数学クラブ http://sugaku.club/
月 日（ ）
● 次の式を，文字式の表し方にしたがって書きましょう
[07C-00]
(1)
a
×
b
×
(
−9
)
×
c
(2)
a
÷
b
÷
c
÷
6
(3)
(
−8
)
×
a
×
b
(4)
a
÷
b
÷
c
÷
(
−8
)
÷
d
(5)
a
×
(
−5
)
÷
b
×
c
(6)
(
−5
)
×
a
×
b
÷
c
(7)
a
÷
b
÷
(
−8
)
÷
c
(8)
a
÷
b
÷
5
(9)
a
×
(
−5
)
×
b
×
c
÷
d
(10)
a
×
b
×
(
−7
)
÷
c
÷
d
(11)
8
×
a
×
b
×
c
÷
d
(12)
a
×
10
÷
b
÷
c
(13)
a
×
b
×
(
−5
)
(14)
a
÷
(
−10
)
×
b
÷
c
÷
d
(15)
(
−5
)
÷
a
÷
b
÷
c
÷
d
(16)
a
×
8
×
b
×
c
(17)
a
÷
b
÷
c
×
(
−10
)
×
d
(18)
a
÷
b
÷
c
×
9
÷
d
(19)
(
−4
)
÷
a
×
b
÷
c
(20)
a
×
b
×
9
÷
c
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
a
×
b
×
(
−9
)
×
c
=
−9
a
b
c
(2)
a
÷
b
÷
c
÷
6
a
=
6
b
c
(3)
(
−8
)
×
a
×
b
=
−8
a
b
(4)
a
÷
b
÷
c
÷
(
−8
)
÷
d
a
=
−
8
b
c
d
(5)
a
×
(
−5
)
÷
b
×
c
5
a
c
=
−
b
(6)
(
−5
)
×
a
×
b
÷
c
5
a
b
=
−
c
(7)
a
÷
b
÷
(
−8
)
÷
c
a
=
−
8
b
c
(8)
a
÷
b
÷
5
a
=
5
b
(9)
a
×
(
−5
)
×
b
×
c
÷
d
5
a
b
c
=
−
d
(10)
a
×
b
×
(
−7
)
÷
c
÷
d
7
a
b
=
−
c
d
(11)
8
×
a
×
b
×
c
÷
d
8
a
b
c
=
d
(12)
a
×
10
÷
b
÷
c
10
a
=
b
c
(13)
a
×
b
×
(
−5
)
=
−5
a
b
(14)
a
÷
(
−10
)
×
b
÷
c
÷
d
a
b
=
−
10
c
d
(15)
(
−5
)
÷
a
÷
b
÷
c
÷
d
5
=
−
a
b
c
d
(16)
a
×
8
×
b
×
c
=
8
a
b
c
(17)
a
÷
b
÷
c
×
(
−10
)
×
d
10
a
d
=
−
b
c
(18)
a
÷
b
÷
c
×
9
÷
d
9
a
=
b
c
d
(19)
(
−4
)
÷
a
×
b
÷
c
4
b
=
−
a
c
(20)
a
×
b
×
9
÷
c
9
a
b
=
c