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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
:
−2
=
−2
x
:
−12
(2)
−4
x
:
48
=
5
:
−15
(3)
−16
:
4
x
=
−16
:
−12
(4)
−3
:
5
=
−4
x
:
20
(5)
15
:
−
x
=
−9
:
−3
(6)
−1
:
−5
=
3
:
x
+
2
(7)
6
:
−3
=
−2
x
:
−6
(8)
9
:
3
=
−12
:
4
x
(9)
−9
:
3
x
=
−2
:
−8
(10)
4
x
:
−12
=
−10
:
15
(11)
−3
:
1
=
3
:
x
+
5
(12)
5
:
−1
=
−2
x
:
−2
(13)
3
x
:
−45
=
−1
:
3
(14)
−6
:
−3
=
x
−
4
:
−1
(15)
2
:
−1
=
50
:
5
x
(16)
4
x
:
−24
=
4
:
3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−1
:
−2
=
−2
x
:
−12
−2
×
(
−2
)
x
=
−
(
−12
)
x
=
3
(2)
−4
x
:
48
=
5
:
−15
−15
×
(
−4
)
x
=
48
×
5
x
=
4
(3)
−16
:
4
x
=
−16
:
−12
−16
×
4
x
=
−16
×
(
−12
)
x
=
−3
(4)
−3
:
5
=
−4
x
:
20
5
×
(
−4
)
x
=
−3
×
20
x
=
3
(5)
15
:
−
x
=
−9
:
−3
−9
×
(
−1
)
x
=
15
×
(
−3
)
x
=
−5
(6)
−1
:
−5
=
3
:
x
+
2
−
(
x
+
2
)
=
−5
×
3
x
+
2
=
15
x
=
13
(7)
6
:
−3
=
−2
x
:
−6
−3
×
(
−2
)
x
=
6
×
(
−6
)
x
=
−6
(8)
9
:
3
=
−12
:
4
x
9
×
4
x
=
3
×
(
−12
)
x
=
−1
(9)
−9
:
3
x
=
−2
:
−8
−2
×
3
x
=
−9
×
(
−8
)
x
=
−12
(10)
4
x
:
−12
=
−10
:
15
15
×
4
x
=
−12
×
(
−10
)
x
=
2
(11)
−3
:
1
=
3
:
x
+
5
−3
×
(
x
+
5
)
=
3
x
+
5
=
−1
x
=
−6
(12)
5
:
−1
=
−2
x
:
−2
−
(
−2
)
x
=
5
×
(
−2
)
x
=
−5
(13)
3
x
:
−45
=
−1
:
3
3
×
3
x
=
−45
×
(
−1
)
x
=
5
(14)
−6
:
−3
=
x
−
4
:
−1
−3
×
(
x
−
4
)
=
−6
×
(
−1
)
x
−
4
=
−2
x
=
2
(15)
2
:
−1
=
50
:
5
x
2
×
5
x
=
−
50
x
=
−5
(16)
4
x
:
−24
=
4
:
3
3
×
4
x
=
−24
×
4
x
=
−8