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