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