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