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