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©2025 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
:
1
=
−4
x
:
20
(2)
5
x
:
−25
=
−8
:
4
(3)
−4
:
2
=
−4
x
:
−4
(4)
x
−
4
:
−1
=
−3
:
1
(5)
x
−
3
:
−1
=
−10
:
−5
(6)
−4
:
1
=
x
+
2
:
3
(7)
−45
:
−3
x
=
25
:
5
(8)
2
:
4
=
1
:
x
−
4
(9)
12
:
−8
=
x
+
2
:
2
(10)
−5
:
3
=
x
+
4
:
−12
(11)
−4
:
2
=
−2
x
:
2
(12)
8
:
4
=
5
x
:
−25
(13)
2
:
x
−
4
=
−8
:
−4
(14)
−2
:
2
=
x
−
2
:
−4
(15)
5
:
−20
=
3
x
:
36
(16)
x
+
3
:
6
=
−3
:
2
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−5
:
1
=
−4
x
:
20
−4
x
=
−5
×
20
x
=
25
(2)
5
x
:
−25
=
−8
:
4
4
×
5
x
=
−25
×
(
−8
)
x
=
10
(3)
−4
:
2
=
−4
x
:
−4
2
×
(
−4
)
x
=
−4
×
(
−4
)
x
=
−2
(4)
x
−
4
:
−1
=
−3
:
1
x
−
4
=
−
(
−3
)
x
−
4
=
3
x
=
7
(5)
x
−
3
:
−1
=
−10
:
−5
−5
×
(
x
−
3
)
=
−
(
−10
)
x
−
3
=
−2
x
=
1
(6)
−4
:
1
=
x
+
2
:
3
x
+
2
=
−4
×
3
x
+
2
=
−12
x
=
−14
(7)
−45
:
−3
x
=
25
:
5
25
×
(
−3
)
x
=
−45
×
5
x
=
3
(8)
2
:
4
=
1
:
x
−
4
2
×
(
x
−
4
)
=
4
x
−
4
=
2
x
=
6
(9)
12
:
−8
=
x
+
2
:
2
−8
×
(
x
+
2
)
=
12
×
2
x
+
2
=
−3
x
=
−5
(10)
−5
:
3
=
x
+
4
:
−12
3
×
(
x
+
4
)
=
−5
×
(
−12
)
x
+
4
=
20
x
=
16
(11)
−4
:
2
=
−2
x
:
2
2
×
(
−2
)
x
=
−4
×
2
x
=
2
(12)
8
:
4
=
5
x
:
−25
4
×
5
x
=
8
×
(
−25
)
x
=
−10
(13)
2
:
x
−
4
=
−8
:
−4
−8
×
(
x
−
4
)
=
2
×
(
−4
)
x
−
4
=
1
x
=
5
(14)
−2
:
2
=
x
−
2
:
−4
2
×
(
x
−
2
)
=
−2
×
(
−4
)
x
−
2
=
4
x
=
6
(15)
5
:
−20
=
3
x
:
36
−20
×
3
x
=
5
×
36
x
=
−3
(16)
x
+
3
:
6
=
−3
:
2
2
×
(
x
+
3
)
=
6
×
(
−3
)
x
+
3
=
−9
x
=
−12