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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
:
3
=
−1
:
x
−
4
(2)
3
:
−3
=
4
x
:
−8
(3)
6
:
x
+
3
=
−4
:
−2
(4)
12
:
−3
=
−8
:
x
−
4
(5)
−5
:
20
=
x
−
1
:
−4
(6)
−6
:
−2
x
=
−2
:
2
(7)
60
:
−4
x
=
−5
:
3
(8)
−3
x
:
3
=
−25
:
−5
(9)
4
:
−10
=
x
−
3
:
5
(10)
−5
:
5
=
4
x
:
4
(11)
−8
:
4
=
x
−
3
:
−1
(12)
20
:
x
−
2
=
15
:
3
(13)
−2
:
−5
=
50
:
−5
x
(14)
−5
x
:
25
=
10
:
−2
(15)
x
+
2
:
−8
=
3
:
6
(16)
−5
:
−5
x
=
2
:
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
1
:
3
=
−1
:
x
−
4
x
−
4
=
3
×
(
−1
)
x
−
4
=
−3
x
=
1
(2)
3
:
−3
=
4
x
:
−8
−3
×
4
x
=
3
×
(
−8
)
x
=
2
(3)
6
:
x
+
3
=
−4
:
−2
−4
×
(
x
+
3
)
=
6
×
(
−2
)
x
+
3
=
3
x
=
0
(4)
12
:
−3
=
−8
:
x
−
4
12
×
(
x
−
4
)
=
−3
×
(
−8
)
x
−
4
=
2
x
=
6
(5)
−5
:
20
=
x
−
1
:
−4
20
×
(
x
−
1
)
=
−5
×
(
−4
)
x
−
1
=
1
x
=
2
(6)
−6
:
−2
x
=
−2
:
2
−2
×
(
−2
)
x
=
−6
×
2
x
=
−3
(7)
60
:
−4
x
=
−5
:
3
−5
×
(
−4
)
x
=
60
×
3
x
=
9
(8)
−3
x
:
3
=
−25
:
−5
−5
×
(
−3
)
x
=
3
×
(
−25
)
x
=
−5
(9)
4
:
−10
=
x
−
3
:
5
−10
×
(
x
−
3
)
=
4
×
5
x
−
3
=
−2
x
=
1
(10)
−5
:
5
=
4
x
:
4
5
×
4
x
=
−5
×
4
x
=
−1
(11)
−8
:
4
=
x
−
3
:
−1
4
×
(
x
−
3
)
=
−8
×
(
−1
)
x
−
3
=
2
x
=
5
(12)
20
:
x
−
2
=
15
:
3
15
×
(
x
−
2
)
=
20
×
3
x
−
2
=
4
x
=
6
(13)
−2
:
−5
=
50
:
−5
x
−2
×
(
−5
)
x
=
−5
×
50
x
=
−25
(14)
−5
x
:
25
=
10
:
−2
−2
×
(
−5
)
x
=
25
×
10
x
=
25
(15)
x
+
2
:
−8
=
3
:
6
6
×
(
x
+
2
)
=
−8
×
3
x
+
2
=
−4
x
=
−6
(16)
−5
:
−5
x
=
2
:
4
2
×
(
−5
)
x
=
−5
×
4
x
=
2