［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
[07E-00]
(1)
(
−5
)
×
a
×
(
b
×
c
)
(2)
(
a
÷
b
)
×
c
÷
d
×
(
−9
)
(3)
(
−7
)
×
(
a
×
b
)
(4)
a
×
b
÷
{
c
×
(
−2
)
}
×
d
(5)
{
(
−9
)
×
a
}
÷
b
(6)
(
−9
)
÷
(
a
÷
b
)
(7)
(
−2
)
×
(
a
÷
b
)
÷
c
(8)
(
a
×
7
)
×
b
×
c
(9)
a
÷
(
6
÷
b
)
÷
c
(10)
{
a
×
(
−2
)
}
×
b
(11)
8
×
a
×
(
b
×
c
)
(12)
a
÷
(
6
÷
b
)
(13)
a
÷
(
8
×
b
)
×
c
×
d
(14)
a
×
b
÷
(
5
×
c
)
÷
d
(15)
a
÷
b
×
(
c
×
4
)
(16)
(
−3
)
÷
(
a
×
b
)
(17)
(
a
×
b
)
×
(
−10
)
(18)
(
−2
)
÷
a
÷
(
b
÷
c
)
×
d
(19)
a
÷
b
×
(
c
÷
d
)
×
(
−9
)
(20)
a
÷
(
b
÷
c
)
÷
3
×
d
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
(
−5
)
×
a
×
(
b
×
c
)
=
−5
a
b
c
(2)
(
a
÷
b
)
×
c
÷
d
×
(
−9
)
9
a
c
=
−
b
d
(3)
(
−7
)
×
(
a
×
b
)
=
−7
a
b
(4)
a
×
b
÷
{
c
×
(
−2
)
}
×
d
a
b
d
=
−
2
c
(5)
{
(
−9
)
×
a
}
÷
b
9
a
=
−
b
(6)
(
−9
)
÷
(
a
÷
b
)
9
b
=
−
a
(7)
(
−2
)
×
(
a
÷
b
)
÷
c
2
a
=
−
b
c
(8)
(
a
×
7
)
×
b
×
c
=
7
a
b
c
(9)
a
÷
(
6
÷
b
)
÷
c
a
b
=
6
c
(10)
{
a
×
(
−2
)
}
×
b
=
−2
a
b
(11)
8
×
a
×
(
b
×
c
)
=
8
a
b
c
(12)
a
÷
(
6
÷
b
)
a
b
=
6
(13)
a
÷
(
8
×
b
)
×
c
×
d
a
c
d
=
8
b
(14)
a
×
b
÷
(
5
×
c
)
÷
d
a
b
=
5
c
d
(15)
a
÷
b
×
(
c
×
4
)
4
a
c
=
b
(16)
(
−3
)
÷
(
a
×
b
)
3
=
−
a
b
(17)
(
a
×
b
)
×
(
−10
)
=
−10
a
b
(18)
(
−2
)
÷
a
÷
(
b
÷
c
)
×
d
2
c
d
=
−
a
b
(19)
a
÷
b
×
(
c
÷
d
)
×
(
−9
)
9
a
c
=
−
b
d
(20)
a
÷
(
b
÷
c
)
÷
3
×
d
a
c
d
=
3
b