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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)
−3
:
−12
=
−1
:
x
(2)
−4
:
−2
=
x
:
−1
(3)
−2
:
5
=
x
:
10
(4)
−2
:
x
=
−3
:
9
(5)
1
:
x
=
−1
:
−2
(6)
x
:
−5
=
−3
:
−1
(7)
−15
:
10
=
x
:
2
(8)
x
:
−5
=
−8
:
−10
(9)
x
:
−4
=
6
:
−8
(10)
x
:
1
=
−9
:
3
(11)
−8
:
2
=
12
:
x
(12)
−1
:
x
=
2
:
4
(13)
1
:
x
=
−1
:
−4
(14)
25
:
x
=
−5
:
3
(15)
20
:
−12
=
x
:
−3
(16)
x
:
1
=
1
:
−1
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−3
:
−12
=
−1
:
x
−3
x
=
−12
×
(
−1
)
x
=
−4
(2)
−4
:
−2
=
x
:
−1
−2
x
=
−4
×
(
−1
)
x
=
−2
(3)
−2
:
5
=
x
:
10
5
x
=
−2
×
10
x
=
−4
(4)
−2
:
x
=
−3
:
9
−3
x
=
−2
×
9
x
=
6
(5)
1
:
x
=
−1
:
−2
−
x
=
−2
x
=
2
(6)
x
:
−5
=
−3
:
−1
−
x
=
−5
×
(
−3
)
x
=
−15
(7)
−15
:
10
=
x
:
2
10
x
=
−15
×
2
x
=
−3
(8)
x
:
−5
=
−8
:
−10
−10
x
=
−5
×
(
−8
)
x
=
−4
(9)
x
:
−4
=
6
:
−8
−8
x
=
−4
×
6
x
=
3
(10)
x
:
1
=
−9
:
3
3
x
=
−9
x
=
−3
(11)
−8
:
2
=
12
:
x
−8
x
=
2
×
12
x
=
−3
(12)
−1
:
x
=
2
:
4
2
x
=
−
4
x
=
−2
(13)
1
:
x
=
−1
:
−4
−
x
=
−4
x
=
4
(14)
25
:
x
=
−5
:
3
−5
x
=
25
×
3
x
=
−15
(15)
20
:
−12
=
x
:
−3
−12
x
=
20
×
(
−3
)
x
=
5
(16)
x
:
1
=
1
:
−1
−
x
=
1
x
=
−1