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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
[0G1-00]
(1)
1
:
3
=
5
x
:
−15
(2)
−5
x
:
60
=
5
:
15
(3)
8
:
−2
=
3
x
:
−12
(4)
5
:
25
=
10
:
−5
x
(5)
−15
:
−5
=
4
x
:
−12
(6)
−8
:
2
x
=
−16
:
20
(7)
−1
:
−5
=
−3
x
:
75
(8)
x
+
2
:
5
=
−8
:
4
(9)
12
:
−4
x
=
−9
:
15
(10)
−3
:
15
=
−20
:
5
x
(11)
1
:
−2
=
x
−
3
:
−4
(12)
−4
:
x
−
3
=
−1
:
1
(13)
−20
:
5
=
24
:
3
x
(14)
4
x
:
−80
=
−2
:
−8
(15)
−15
:
−3
x
=
−20
:
16
(16)
2
:
−3
=
3
x
:
−27
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
1
:
3
=
5
x
:
−15
3
×
5
x
=
−15
x
=
−1
(2)
−5
x
:
60
=
5
:
15
15
×
(
−5
)
x
=
60
×
5
x
=
−4
(3)
8
:
−2
=
3
x
:
−12
−2
×
3
x
=
8
×
(
−12
)
x
=
16
(4)
5
:
25
=
10
:
−5
x
5
×
(
−5
)
x
=
25
×
10
x
=
−10
(5)
−15
:
−5
=
4
x
:
−12
−5
×
4
x
=
−15
×
(
−12
)
x
=
−9
(6)
−8
:
2
x
=
−16
:
20
−16
×
2
x
=
−8
×
20
x
=
5
(7)
−1
:
−5
=
−3
x
:
75
−5
×
(
−3
)
x
=
−
75
x
=
−5
(8)
x
+
2
:
5
=
−8
:
4
4
×
(
x
+
2
)
=
5
×
(
−8
)
x
+
2
=
−10
x
=
−12
(9)
12
:
−4
x
=
−9
:
15
−9
×
(
−4
)
x
=
12
×
15
x
=
5
(10)
−3
:
15
=
−20
:
5
x
−3
×
5
x
=
15
×
(
−20
)
x
=
20
(11)
1
:
−2
=
x
−
3
:
−4
−2
×
(
x
−
3
)
=
−4
x
−
3
=
2
x
=
5
(12)
−4
:
x
−
3
=
−1
:
1
−
(
x
−
3
)
=
−4
x
−
3
=
4
x
=
7
(13)
−20
:
5
=
24
:
3
x
−20
×
3
x
=
5
×
24
x
=
−2
(14)
4
x
:
−80
=
−2
:
−8
−8
×
4
x
=
−80
×
(
−2
)
x
=
−5
(15)
−15
:
−3
x
=
−20
:
16
−20
×
(
−3
)
x
=
−15
×
16
x
=
−4
(16)
2
:
−3
=
3
x
:
−27
−3
×
3
x
=
2
×
(
−27
)
x
=
6