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©2026 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)
9
÷
a
×
(
b
÷
c
)
×
d
(2)
a
×
b
×
{
c
×
(
−2
)
}
×
d
(3)
7
×
a
×
(
b
÷
c
)
÷
d
(4)
a
÷
{
(
−2
)
×
b
}
(5)
(
5
×
a
)
÷
b
×
c
(6)
a
×
b
÷
(
6
×
c
)
(7)
(
a
×
b
)
×
c
÷
(
−9
)
(8)
a
÷
b
×
(
−4
)
÷
(
c
÷
d
)
(9)
(
a
÷
b
)
×
9
(10)
a
×
(
b
÷
c
)
×
d
×
9
(11)
a
÷
(
b
×
c
)
×
9
÷
d
(12)
(
−4
)
÷
(
a
×
b
)
(13)
a
÷
{
b
×
(
−9
)
}
(14)
a
÷
b
÷
(
c
÷
2
)
(15)
(
a
÷
b
)
÷
c
÷
d
÷
(
−5
)
(16)
(
a
×
b
)
÷
5
(17)
(
a
÷
b
)
×
(
−2
)
÷
c
÷
d
(18)
a
×
{
b
÷
(
−3
)
}
÷
c
×
d
(19)
a
÷
8
÷
(
b
×
c
)
÷
d
(20)
6
÷
a
×
(
b
×
c
)
÷
d
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
9
÷
a
×
(
b
÷
c
)
×
d
9
b
d
=
a
c
(2)
a
×
b
×
{
c
×
(
−2
)
}
×
d
=
−2
a
b
c
d
(3)
7
×
a
×
(
b
÷
c
)
÷
d
7
a
b
=
c
d
(4)
a
÷
{
(
−2
)
×
b
}
a
=
−
2
b
(5)
(
5
×
a
)
÷
b
×
c
5
a
c
=
b
(6)
a
×
b
÷
(
6
×
c
)
a
b
=
6
c
(7)
(
a
×
b
)
×
c
÷
(
−9
)
a
b
c
=
−
9
(8)
a
÷
b
×
(
−4
)
÷
(
c
÷
d
)
4
a
d
=
−
b
c
(9)
(
a
÷
b
)
×
9
9
a
=
b
(10)
a
×
(
b
÷
c
)
×
d
×
9
9
a
b
d
=
c
(11)
a
÷
(
b
×
c
)
×
9
÷
d
9
a
=
b
c
d
(12)
(
−4
)
÷
(
a
×
b
)
4
=
−
a
b
(13)
a
÷
{
b
×
(
−9
)
}
a
=
−
9
b
(14)
a
÷
b
÷
(
c
÷
2
)
2
a
=
b
c
(15)
(
a
÷
b
)
÷
c
÷
d
÷
(
−5
)
a
=
−
5
b
c
d
(16)
(
a
×
b
)
÷
5
a
b
=
5
(17)
(
a
÷
b
)
×
(
−2
)
÷
c
÷
d
2
a
=
−
b
c
d
(18)
a
×
{
b
÷
(
−3
)
}
÷
c
×
d
a
b
d
=
−
3
c
(19)
a
÷
8
÷
(
b
×
c
)
÷
d
a
=
8
b
c
d
(20)
6
÷
a
×
(
b
×
c
)
÷
d
6
b
c
=
a
d