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