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