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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)
5
:
x
−
1
=
4
:
−20
(2)
−5
:
−3
=
−10
:
x
+
2
(3)
−4
:
−2
x
=
1
:
−2
(4)
−5
:
−4
=
5
x
:
60
(5)
−9
:
−15
=
5
x
:
25
(6)
5
:
−5
=
x
−
4
:
−20
(7)
x
−
3
:
1
=
12
:
3
(8)
x
−
4
:
8
=
5
:
4
(9)
3
x
:
−12
=
−3
:
−12
(10)
6
:
−3
=
−6
:
x
−
3
(11)
1
:
5
=
x
+
5
:
−5
(12)
5
x
:
5
=
−4
:
4
(13)
−4
:
−16
=
1
:
x
−
4
(14)
12
:
−8
=
3
:
x
+
3
(15)
−2
x
:
8
=
20
:
−5
(16)
−
x
:
5
=
−4
:
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
5
:
x
−
1
=
4
:
−20
4
×
(
x
−
1
)
=
5
×
(
−20
)
x
−
1
=
−25
x
=
−24
(2)
−5
:
−3
=
−10
:
x
+
2
−5
×
(
x
+
2
)
=
−3
×
(
−10
)
x
+
2
=
−6
x
=
−8
(3)
−4
:
−2
x
=
1
:
−2
−2
x
=
−4
×
(
−2
)
x
=
−4
(4)
−5
:
−4
=
5
x
:
60
−4
×
5
x
=
−5
×
60
x
=
15
(5)
−9
:
−15
=
5
x
:
25
−15
×
5
x
=
−9
×
25
x
=
3
(6)
5
:
−5
=
x
−
4
:
−20
−5
×
(
x
−
4
)
=
5
×
(
−20
)
x
−
4
=
20
x
=
24
(7)
x
−
3
:
1
=
12
:
3
3
×
(
x
−
3
)
=
12
x
−
3
=
4
x
=
7
(8)
x
−
4
:
8
=
5
:
4
4
×
(
x
−
4
)
=
8
×
5
x
−
4
=
10
x
=
14
(9)
3
x
:
−12
=
−3
:
−12
−12
×
3
x
=
−12
×
(
−3
)
x
=
−1
(10)
6
:
−3
=
−6
:
x
−
3
6
×
(
x
−
3
)
=
−3
×
(
−6
)
x
−
3
=
3
x
=
6
(11)
1
:
5
=
x
+
5
:
−5
5
×
(
x
+
5
)
=
−5
x
+
5
=
−1
x
=
−6
(12)
5
x
:
5
=
−4
:
4
4
×
5
x
=
5
×
(
−4
)
x
=
−1
(13)
−4
:
−16
=
1
:
x
−
4
−4
×
(
x
−
4
)
=
−16
x
−
4
=
4
x
=
8
(14)
12
:
−8
=
3
:
x
+
3
12
×
(
x
+
3
)
=
−8
×
3
x
+
3
=
−2
x
=
−5
(15)
−2
x
:
8
=
20
:
−5
−5
×
(
−2
)
x
=
8
×
20
x
=
16
(16)
−
x
:
5
=
−4
:
4
4
×
(
−1
)
x
=
5
×
(
−4
)
x
=
5