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©2024 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
÷
(
b
×
c
)
×
(
−2
)
(2)
a
÷
(
10
÷
b
)
(3)
a
÷
b
÷
4
×
(
c
×
d
)
(4)
(
−9
)
×
a
×
(
b
÷
c
)
(5)
{
a
×
(
−5
)
}
÷
b
(6)
{
(
−2
)
÷
a
}
÷
b
÷
c
(7)
(
a
÷
9
)
×
b
×
c
(8)
(
a
×
b
)
×
(
−3
)
(9)
(
a
÷
b
)
÷
9
÷
c
×
d
(10)
a
×
b
×
c
÷
{
(
−5
)
×
d
}
(11)
a
÷
(
b
÷
c
)
÷
2
(12)
(
a
÷
b
)
÷
3
×
c
(13)
a
×
(
6
×
b
)
(14)
a
÷
{
(
−4
)
÷
b
}
÷
c
×
d
(15)
a
÷
(
b
÷
c
)
×
d
×
5
(16)
10
×
(
a
×
b
)
÷
c
÷
d
(17)
a
×
{
(
−9
)
÷
b
}
(18)
(
−4
)
÷
a
÷
(
b
÷
c
)
(19)
a
×
(
−10
)
÷
(
b
×
c
)
×
d
(20)
(
−2
)
÷
(
a
÷
b
)
×
c
×
d
©2024 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
a
÷
(
b
×
c
)
×
(
−2
)
2
a
=
−
b
c
(2)
a
÷
(
10
÷
b
)
a
b
=
10
(3)
a
÷
b
÷
4
×
(
c
×
d
)
a
c
d
=
4
b
(4)
(
−9
)
×
a
×
(
b
÷
c
)
9
a
b
=
−
c
(5)
{
a
×
(
−5
)
}
÷
b
5
a
=
−
b
(6)
{
(
−2
)
÷
a
}
÷
b
÷
c
2
=
−
a
b
c
(7)
(
a
÷
9
)
×
b
×
c
a
b
c
=
9
(8)
(
a
×
b
)
×
(
−3
)
=
−3
a
b
(9)
(
a
÷
b
)
÷
9
÷
c
×
d
a
d
=
9
b
c
(10)
a
×
b
×
c
÷
{
(
−5
)
×
d
}
a
b
c
=
−
5
d
(11)
a
÷
(
b
÷
c
)
÷
2
a
c
=
2
b
(12)
(
a
÷
b
)
÷
3
×
c
a
c
=
3
b
(13)
a
×
(
6
×
b
)
=
6
a
b
(14)
a
÷
{
(
−4
)
÷
b
}
÷
c
×
d
a
b
d
=
−
4
c
(15)
a
÷
(
b
÷
c
)
×
d
×
5
5
a
c
d
=
b
(16)
10
×
(
a
×
b
)
÷
c
÷
d
10
a
b
=
c
d
(17)
a
×
{
(
−9
)
÷
b
}
9
a
=
−
b
(18)
(
−4
)
÷
a
÷
(
b
÷
c
)
4
c
=
−
a
b
(19)
a
×
(
−10
)
÷
(
b
×
c
)
×
d
10
a
d
=
−
b
c
(20)
(
−2
)
÷
(
a
÷
b
)
×
c
×
d
2
b
c
d
=
−
a