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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)
x
:
−12
=
5
:
−20
(2)
−6
:
8
=
x
:
4
(3)
−4
:
16
=
−2
:
x
(4)
−4
:
1
=
8
:
x
(5)
x
:
−8
=
−1
:
4
(6)
2
:
x
=
1
:
2
(7)
−5
:
20
=
x
:
−12
(8)
−2
:
−8
=
x
:
−4
(9)
−15
:
15
=
−3
:
x
(10)
−5
:
x
=
5
:
4
(11)
−5
:
4
=
−20
:
x
(12)
−1
:
−5
=
1
:
x
(13)
−4
:
x
=
−2
:
1
(14)
4
:
16
=
−4
:
x
(15)
10
:
−8
=
5
:
x
(16)
−8
:
6
=
x
:
3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
:
−12
=
5
:
−20
−20
x
=
−12
×
5
x
=
3
(2)
−6
:
8
=
x
:
4
8
x
=
−6
×
4
x
=
−3
(3)
−4
:
16
=
−2
:
x
−4
x
=
16
×
(
−2
)
x
=
8
(4)
−4
:
1
=
8
:
x
−4
x
=
8
x
=
−2
(5)
x
:
−8
=
−1
:
4
4
x
=
−8
×
(
−1
)
x
=
2
(6)
2
:
x
=
1
:
2
x
=
2
×
2
x
=
4
(7)
−5
:
20
=
x
:
−12
20
x
=
−5
×
(
−12
)
x
=
3
(8)
−2
:
−8
=
x
:
−4
−8
x
=
−2
×
(
−4
)
x
=
−1
(9)
−15
:
15
=
−3
:
x
−15
x
=
15
×
(
−3
)
x
=
3
(10)
−5
:
x
=
5
:
4
5
x
=
−5
×
4
x
=
−4
(11)
−5
:
4
=
−20
:
x
−5
x
=
4
×
(
−20
)
x
=
16
(12)
−1
:
−5
=
1
:
x
−
x
=
−5
x
=
5
(13)
−4
:
x
=
−2
:
1
−2
x
=
−4
x
=
2
(14)
4
:
16
=
−4
:
x
4
x
=
16
×
(
−4
)
x
=
−16
(15)
10
:
−8
=
5
:
x
10
x
=
−8
×
5
x
=
−4
(16)
−8
:
6
=
x
:
3
6
x
=
−8
×
3
x
=
−4