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