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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)
−6
:
−
x
=
−3
:
5
(2)
5
:
−5
=
−3
:
−3
x
(3)
4
:
−1
=
−2
x
:
−6
(4)
5
x
:
10
=
2
:
4
(5)
4
:
3
=
−5
x
:
−75
(6)
x
+
2
:
5
=
−1
:
1
(7)
−20
:
−15
=
−3
x
:
−9
(8)
−12
:
−3
=
20
:
x
+
5
(9)
x
−
1
:
−4
=
5
:
2
(10)
10
:
5
=
x
+
4
:
−1
(11)
25
:
−5
x
=
5
:
1
(12)
5
:
x
−
5
=
−1
:
−2
(13)
−8
:
−4
x
=
−2
:
5
(14)
−2
:
x
−
3
=
1
:
−4
(15)
−15
:
5
x
=
−15
:
5
(16)
9
:
x
−
3
=
−3
:
−2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−6
:
−
x
=
−3
:
5
−3
×
(
−1
)
x
=
−6
×
5
x
=
−10
(2)
5
:
−5
=
−3
:
−3
x
5
×
(
−3
)
x
=
−5
×
(
−3
)
x
=
−1
(3)
4
:
−1
=
−2
x
:
−6
−
(
−2
)
x
=
4
×
(
−6
)
x
=
−12
(4)
5
x
:
10
=
2
:
4
4
×
5
x
=
10
×
2
x
=
1
(5)
4
:
3
=
−5
x
:
−75
3
×
(
−5
)
x
=
4
×
(
−75
)
x
=
20
(6)
x
+
2
:
5
=
−1
:
1
x
+
2
=
5
×
(
−1
)
x
+
2
=
−5
x
=
−7
(7)
−20
:
−15
=
−3
x
:
−9
−15
×
(
−3
)
x
=
−20
×
(
−9
)
x
=
4
(8)
−12
:
−3
=
20
:
x
+
5
−12
×
(
x
+
5
)
=
−3
×
20
x
+
5
=
5
x
=
0
(9)
x
−
1
:
−4
=
5
:
2
2
×
(
x
−
1
)
=
−4
×
5
x
−
1
=
−10
x
=
−9
(10)
10
:
5
=
x
+
4
:
−1
5
×
(
x
+
4
)
=
10
×
(
−1
)
x
+
4
=
−2
x
=
−6
(11)
25
:
−5
x
=
5
:
1
5
×
(
−5
)
x
=
25
x
=
−1
(12)
5
:
x
−
5
=
−1
:
−2
−
(
x
−
5
)
=
5
×
(
−2
)
x
−
5
=
10
x
=
15
(13)
−8
:
−4
x
=
−2
:
5
−2
×
(
−4
)
x
=
−8
×
5
x
=
−5
(14)
−2
:
x
−
3
=
1
:
−4
x
−
3
=
−2
×
(
−4
)
x
−
3
=
8
x
=
11
(15)
−15
:
5
x
=
−15
:
5
−15
×
5
x
=
−15
×
5
x
=
1
(16)
9
:
x
−
3
=
−3
:
−2
−3
×
(
x
−
3
)
=
9
×
(
−2
)
x
−
3
=
6
x
=
9