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©2025 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
:
2
=
−3
x
:
−12
(2)
x
+
4
:
−9
=
−5
:
3
(3)
4
:
4
x
=
−3
:
3
(4)
−24
:
−2
x
=
15
:
5
(5)
−20
:
−4
=
−10
:
2
x
(6)
−4
:
−
x
=
−5
:
20
(7)
5
:
−15
=
−8
:
4
x
(8)
−3
x
:
−12
=
4
:
−16
(9)
−2
x
:
−2
=
−8
:
−2
(10)
5
:
x
−
1
=
−3
:
6
(11)
10
:
x
−
1
=
−5
:
−2
(12)
−2
:
2
=
−3
:
x
−
1
(13)
1
:
−1
=
3
:
x
−
1
(14)
4
x
:
−60
=
−4
:
−20
(15)
x
−
5
:
−8
=
−2
:
−4
(16)
−6
:
−3
=
−4
:
x
+
5
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
1
:
2
=
−3
x
:
−12
2
×
(
−3
)
x
=
−12
x
=
2
(2)
x
+
4
:
−9
=
−5
:
3
3
×
(
x
+
4
)
=
−9
×
(
−5
)
x
+
4
=
15
x
=
11
(3)
4
:
4
x
=
−3
:
3
−3
×
4
x
=
4
×
3
x
=
−1
(4)
−24
:
−2
x
=
15
:
5
15
×
(
−2
)
x
=
−24
×
5
x
=
4
(5)
−20
:
−4
=
−10
:
2
x
−20
×
2
x
=
−4
×
(
−10
)
x
=
−1
(6)
−4
:
−
x
=
−5
:
20
−5
×
(
−1
)
x
=
−4
×
20
x
=
−16
(7)
5
:
−15
=
−8
:
4
x
5
×
4
x
=
−15
×
(
−8
)
x
=
6
(8)
−3
x
:
−12
=
4
:
−16
−16
×
(
−3
)
x
=
−12
×
4
x
=
−1
(9)
−2
x
:
−2
=
−8
:
−2
−2
×
(
−2
)
x
=
−2
×
(
−8
)
x
=
4
(10)
5
:
x
−
1
=
−3
:
6
−3
×
(
x
−
1
)
=
5
×
6
x
−
1
=
−10
x
=
−9
(11)
10
:
x
−
1
=
−5
:
−2
−5
×
(
x
−
1
)
=
10
×
(
−2
)
x
−
1
=
4
x
=
5
(12)
−2
:
2
=
−3
:
x
−
1
−2
×
(
x
−
1
)
=
2
×
(
−3
)
x
−
1
=
3
x
=
4
(13)
1
:
−1
=
3
:
x
−
1
x
−
1
=
−
3
x
−
1
=
−3
x
=
−2
(14)
4
x
:
−60
=
−4
:
−20
−20
×
4
x
=
−60
×
(
−4
)
x
=
−3
(15)
x
−
5
:
−8
=
−2
:
−4
−4
×
(
x
−
5
)
=
−8
×
(
−2
)
x
−
5
=
−4
x
=
1
(16)
−6
:
−3
=
−4
:
x
+
5
−6
×
(
x
+
5
)
=
−3
×
(
−4
)
x
+
5
=
−2
x
=
−7