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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)
−2
:
−4
=
−3
x
:
−24
(2)
−3
:
x
−
5
=
15
:
−5
(3)
−3
x
:
−3
=
25
:
−5
(4)
15
:
−5
x
=
−9
:
−6
(5)
x
−
3
:
−2
=
10
:
−4
(6)
−2
:
8
=
x
+
4
:
−20
(7)
−3
:
−1
=
6
:
x
−
2
(8)
−1
:
−4
=
x
−
2
:
16
(9)
−20
:
5
=
4
:
x
+
4
(10)
4
:
x
+
3
=
2
:
−2
(11)
4
:
1
=
−20
:
5
x
(12)
−
x
:
4
=
−3
:
4
(13)
2
:
6
=
5
x
:
15
(14)
−4
:
x
+
4
=
−16
:
−12
(15)
20
:
−15
=
−8
:
2
x
(16)
−4
:
−2
=
x
−
2
:
10
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−2
:
−4
=
−3
x
:
−24
−4
×
(
−3
)
x
=
−2
×
(
−24
)
x
=
4
(2)
−3
:
x
−
5
=
15
:
−5
15
×
(
x
−
5
)
=
−3
×
(
−5
)
x
−
5
=
1
x
=
6
(3)
−3
x
:
−3
=
25
:
−5
−5
×
(
−3
)
x
=
−3
×
25
x
=
−5
(4)
15
:
−5
x
=
−9
:
−6
−9
×
(
−5
)
x
=
15
×
(
−6
)
x
=
−2
(5)
x
−
3
:
−2
=
10
:
−4
−4
×
(
x
−
3
)
=
−2
×
10
x
−
3
=
5
x
=
8
(6)
−2
:
8
=
x
+
4
:
−20
8
×
(
x
+
4
)
=
−2
×
(
−20
)
x
+
4
=
5
x
=
1
(7)
−3
:
−1
=
6
:
x
−
2
−3
×
(
x
−
2
)
=
−
6
x
−
2
=
2
x
=
4
(8)
−1
:
−4
=
x
−
2
:
16
−4
×
(
x
−
2
)
=
−
16
x
−
2
=
4
x
=
6
(9)
−20
:
5
=
4
:
x
+
4
−20
×
(
x
+
4
)
=
5
×
4
x
+
4
=
−1
x
=
−5
(10)
4
:
x
+
3
=
2
:
−2
2
×
(
x
+
3
)
=
4
×
(
−2
)
x
+
3
=
−4
x
=
−7
(11)
4
:
1
=
−20
:
5
x
4
×
5
x
=
−20
x
=
−1
(12)
−
x
:
4
=
−3
:
4
4
×
(
−1
)
x
=
4
×
(
−3
)
x
=
3
(13)
2
:
6
=
5
x
:
15
6
×
5
x
=
2
×
15
x
=
1
(14)
−4
:
x
+
4
=
−16
:
−12
−16
×
(
x
+
4
)
=
−4
×
(
−12
)
x
+
4
=
−3
x
=
−7
(15)
20
:
−15
=
−8
:
2
x
20
×
2
x
=
−15
×
(
−8
)
x
=
3
(16)
−4
:
−2
=
x
−
2
:
10
−2
×
(
x
−
2
)
=
−4
×
10
x
−
2
=
20
x
=
22