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