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©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の比例式を解きなさい
[0G0-00]
(1)
−25
:
−15
=
x
:
3
(2)
−2
:
−3
=
−6
:
x
(3)
3
:
−1
=
x
:
4
(4)
−4
:
x
=
−1
:
1
(5)
4
:
−8
=
1
:
x
(6)
−5
:
15
=
−3
:
x
(7)
1
:
5
=
x
:
−5
(8)
x
:
−1
=
−12
:
4
(9)
−5
:
x
=
10
:
2
(10)
−8
:
4
=
x
:
−2
(11)
4
:
1
=
x
:
−4
(12)
x
:
3
=
−5
:
−3
(13)
2
:
−3
=
8
:
x
(14)
−4
:
4
=
x
:
5
(15)
10
:
−5
=
−6
:
x
(16)
x
:
1
=
−3
:
−1
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−25
:
−15
=
x
:
3
−15
x
=
−25
×
3
x
=
5
(2)
−2
:
−3
=
−6
:
x
−2
x
=
−3
×
(
−6
)
x
=
−9
(3)
3
:
−1
=
x
:
4
−
x
=
3
×
4
x
=
−12
(4)
−4
:
x
=
−1
:
1
−
x
=
−4
x
=
4
(5)
4
:
−8
=
1
:
x
4
x
=
−8
x
=
−2
(6)
−5
:
15
=
−3
:
x
−5
x
=
15
×
(
−3
)
x
=
9
(7)
1
:
5
=
x
:
−5
5
x
=
−5
x
=
−1
(8)
x
:
−1
=
−12
:
4
4
x
=
−
(
−12
)
x
=
3
(9)
−5
:
x
=
10
:
2
10
x
=
−5
×
2
x
=
−1
(10)
−8
:
4
=
x
:
−2
4
x
=
−8
×
(
−2
)
x
=
4
(11)
4
:
1
=
x
:
−4
x
=
4
×
(
−4
)
x
=
−16
(12)
x
:
3
=
−5
:
−3
−3
x
=
3
×
(
−5
)
x
=
5
(13)
2
:
−3
=
8
:
x
2
x
=
−3
×
8
x
=
−12
(14)
−4
:
4
=
x
:
5
4
x
=
−4
×
5
x
=
−5
(15)
10
:
−5
=
−6
:
x
10
x
=
−5
×
(
−6
)
x
=
3
(16)
x
:
1
=
−3
:
−1
−
x
=
−3
x
=
3