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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)
−5
:
x
−
2
=
−15
:
3
(2)
−4
:
−12
=
−5
:
x
−
1
(3)
x
−
5
:
3
=
25
:
5
(4)
3
:
1
=
9
:
−3
x
(5)
8
:
2
x
=
−4
:
5
(6)
12
:
x
+
3
=
4
:
−1
(7)
−5
:
x
−
3
=
5
:
−4
(8)
16
:
−4
=
20
:
x
+
4
(9)
−12
:
−3
x
=
−20
:
5
(10)
3
:
4
=
−12
:
x
−
4
(11)
−8
:
4
x
=
2
:
5
(12)
−12
:
−3
=
60
:
5
x
(13)
−2
:
−3
=
−2
x
:
−30
(14)
−3
x
:
15
=
−16
:
4
(15)
−1
:
−4
=
−2
:
x
−
5
(16)
1
:
2
=
x
−
2
:
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−5
:
x
−
2
=
−15
:
3
−15
×
(
x
−
2
)
=
−5
×
3
x
−
2
=
1
x
=
3
(2)
−4
:
−12
=
−5
:
x
−
1
−4
×
(
x
−
1
)
=
−12
×
(
−5
)
x
−
1
=
−15
x
=
−14
(3)
x
−
5
:
3
=
25
:
5
5
×
(
x
−
5
)
=
3
×
25
x
−
5
=
15
x
=
20
(4)
3
:
1
=
9
:
−3
x
3
×
(
−3
)
x
=
9
x
=
−1
(5)
8
:
2
x
=
−4
:
5
−4
×
2
x
=
8
×
5
x
=
−5
(6)
12
:
x
+
3
=
4
:
−1
4
×
(
x
+
3
)
=
12
×
(
−1
)
x
+
3
=
−3
x
=
−6
(7)
−5
:
x
−
3
=
5
:
−4
5
×
(
x
−
3
)
=
−5
×
(
−4
)
x
−
3
=
4
x
=
7
(8)
16
:
−4
=
20
:
x
+
4
16
×
(
x
+
4
)
=
−4
×
20
x
+
4
=
−5
x
=
−9
(9)
−12
:
−3
x
=
−20
:
5
−20
×
(
−3
)
x
=
−12
×
5
x
=
−1
(10)
3
:
4
=
−12
:
x
−
4
3
×
(
x
−
4
)
=
4
×
(
−12
)
x
−
4
=
−16
x
=
−12
(11)
−8
:
4
x
=
2
:
5
2
×
4
x
=
−8
×
5
x
=
−5
(12)
−12
:
−3
=
60
:
5
x
−12
×
5
x
=
−3
×
60
x
=
3
(13)
−2
:
−3
=
−2
x
:
−30
−3
×
(
−2
)
x
=
−2
×
(
−30
)
x
=
10
(14)
−3
x
:
15
=
−16
:
4
4
×
(
−3
)
x
=
15
×
(
−16
)
x
=
20
(15)
−1
:
−4
=
−2
:
x
−
5
−
(
x
−
5
)
=
−4
×
(
−2
)
x
−
5
=
−8
x
=
−3
(16)
1
:
2
=
x
−
2
:
4
2
×
(
x
−
2
)
=
4
x
−
2
=
2
x
=
4