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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)
−3
:
−1
=
5
x
:
5
(2)
3
x
:
6
=
−15
:
10
(3)
20
:
8
=
−20
:
−4
x
(4)
5
:
3
=
50
:
5
x
(5)
−3
:
3
=
x
−
1
:
1
(6)
2
:
−8
=
−
x
:
−20
(7)
−12
:
−20
=
−9
:
−3
x
(8)
x
+
5
:
−5
=
2
:
10
(9)
x
−
1
:
−3
=
−6
:
9
(10)
−4
:
x
−
2
=
1
:
2
(11)
3
:
−12
=
2
x
:
8
(12)
−16
:
4
x
=
4
:
−5
(13)
−8
:
8
=
−8
:
2
x
(14)
−30
:
−5
x
=
−10
:
5
(15)
8
:
6
=
−4
x
:
12
(16)
4
:
−4
=
x
−
5
:
3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−3
:
−1
=
5
x
:
5
−
5
x
=
−3
×
5
x
=
3
(2)
3
x
:
6
=
−15
:
10
10
×
3
x
=
6
×
(
−15
)
x
=
−3
(3)
20
:
8
=
−20
:
−4
x
20
×
(
−4
)
x
=
8
×
(
−20
)
x
=
2
(4)
5
:
3
=
50
:
5
x
5
×
5
x
=
3
×
50
x
=
6
(5)
−3
:
3
=
x
−
1
:
1
3
×
(
x
−
1
)
=
−3
x
−
1
=
−1
x
=
0
(6)
2
:
−8
=
−
x
:
−20
−8
×
(
−1
)
x
=
2
×
(
−20
)
x
=
−5
(7)
−12
:
−20
=
−9
:
−3
x
−12
×
(
−3
)
x
=
−20
×
(
−9
)
x
=
5
(8)
x
+
5
:
−5
=
2
:
10
10
×
(
x
+
5
)
=
−5
×
2
x
+
5
=
−1
x
=
−6
(9)
x
−
1
:
−3
=
−6
:
9
9
×
(
x
−
1
)
=
−3
×
(
−6
)
x
−
1
=
2
x
=
3
(10)
−4
:
x
−
2
=
1
:
2
x
−
2
=
−4
×
2
x
−
2
=
−8
x
=
−6
(11)
3
:
−12
=
2
x
:
8
−12
×
2
x
=
3
×
8
x
=
−1
(12)
−16
:
4
x
=
4
:
−5
4
×
4
x
=
−16
×
(
−5
)
x
=
5
(13)
−8
:
8
=
−8
:
2
x
−8
×
2
x
=
8
×
(
−8
)
x
=
4
(14)
−30
:
−5
x
=
−10
:
5
−10
×
(
−5
)
x
=
−30
×
5
x
=
−3
(15)
8
:
6
=
−4
x
:
12
6
×
(
−4
)
x
=
8
×
12
x
=
−4
(16)
4
:
−4
=
x
−
5
:
3
−4
×
(
x
−
5
)
=
4
×
3
x
−
5
=
−3
x
=
2