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©2026 数学クラブ http://sugaku.club/
月 日( )
● 次の比例式を解きなさい
[0G0-00]
(1)
−3
:
x
=
1
:
4
(2)
2
:
x
=
−2
:
−3
(3)
x
:
2
=
4
:
−8
(4)
−8
:
20
=
x
:
−5
(5)
−4
:
−12
=
1
:
x
(6)
2
:
x
=
6
:
3
(7)
−1
:
3
=
x
:
−15
(8)
1
:
x
=
3
:
−3
(9)
16
:
8
=
−4
:
x
(10)
4
:
−1
=
−8
:
x
(11)
x
:
4
=
−3
:
−4
(12)
−5
:
20
=
x
:
−12
(13)
x
:
−16
=
−2
:
−4
(14)
5
:
−1
=
20
:
x
(15)
x
:
−4
=
−5
:
−1
(16)
5
:
10
=
x
:
−2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−3
:
x
=
1
:
4
x
=
−3
×
4
x
=
−12
(2)
2
:
x
=
−2
:
−3
−2
x
=
2
×
(
−3
)
x
=
3
(3)
x
:
2
=
4
:
−8
−8
x
=
2
×
4
x
=
−1
(4)
−8
:
20
=
x
:
−5
20
x
=
−8
×
(
−5
)
x
=
2
(5)
−4
:
−12
=
1
:
x
−4
x
=
−12
x
=
3
(6)
2
:
x
=
6
:
3
6
x
=
2
×
3
x
=
1
(7)
−1
:
3
=
x
:
−15
3
x
=
−
(
−15
)
x
=
5
(8)
1
:
x
=
3
:
−3
3
x
=
−3
x
=
−1
(9)
16
:
8
=
−4
:
x
16
x
=
8
×
(
−4
)
x
=
−2
(10)
4
:
−1
=
−8
:
x
4
x
=
−
(
−8
)
x
=
2
(11)
x
:
4
=
−3
:
−4
−4
x
=
4
×
(
−3
)
x
=
3
(12)
−5
:
20
=
x
:
−12
20
x
=
−5
×
(
−12
)
x
=
3
(13)
x
:
−16
=
−2
:
−4
−4
x
=
−16
×
(
−2
)
x
=
−8
(14)
5
:
−1
=
20
:
x
5
x
=
−
20
x
=
−4
(15)
x
:
−4
=
−5
:
−1
−
x
=
−4
×
(
−5
)
x
=
−20
(16)
5
:
10
=
x
:
−2
10
x
=
5
×
(
−2
)
x
=
−1