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