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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)
−4
:
−8
=
−4
:
2
x
(2)
−
x
:
20
=
−5
:
20
(3)
−2
:
x
−
2
=
−4
:
4
(4)
4
:
x
+
4
=
16
:
−16
(5)
2
:
1
=
−
x
:
−2
(6)
3
:
−3
=
x
−
1
:
−2
(7)
−5
:
−15
=
4
x
:
12
(8)
1
:
−2
=
−2
:
−
x
(9)
x
+
2
:
15
=
5
:
−3
(10)
10
:
−5
=
−8
:
x
−
3
(11)
−4
:
−12
=
−3
x
:
−9
(12)
20
:
−4
=
75
:
3
x
(13)
−9
:
−3
=
x
−
1
:
2
(14)
−2
:
x
−
3
=
2
:
−5
(15)
9
:
−3
=
12
:
x
+
3
(16)
4
x
:
48
=
5
:
3
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−4
:
−8
=
−4
:
2
x
−4
×
2
x
=
−8
×
(
−4
)
x
=
−4
(2)
−
x
:
20
=
−5
:
20
20
×
(
−1
)
x
=
20
×
(
−5
)
x
=
5
(3)
−2
:
x
−
2
=
−4
:
4
−4
×
(
x
−
2
)
=
−2
×
4
x
−
2
=
2
x
=
4
(4)
4
:
x
+
4
=
16
:
−16
16
×
(
x
+
4
)
=
4
×
(
−16
)
x
+
4
=
−4
x
=
−8
(5)
2
:
1
=
−
x
:
−2
−1
x
=
2
×
(
−2
)
x
=
4
(6)
3
:
−3
=
x
−
1
:
−2
−3
×
(
x
−
1
)
=
3
×
(
−2
)
x
−
1
=
2
x
=
3
(7)
−5
:
−15
=
4
x
:
12
−15
×
4
x
=
−5
×
12
x
=
1
(8)
1
:
−2
=
−2
:
−
x
−1
x
=
−2
×
(
−2
)
x
=
−4
(9)
x
+
2
:
15
=
5
:
−3
−3
×
(
x
+
2
)
=
15
×
5
x
+
2
=
−25
x
=
−27
(10)
10
:
−5
=
−8
:
x
−
3
10
×
(
x
−
3
)
=
−5
×
(
−8
)
x
−
3
=
4
x
=
7
(11)
−4
:
−12
=
−3
x
:
−9
−12
×
(
−3
)
x
=
−4
×
(
−9
)
x
=
1
(12)
20
:
−4
=
75
:
3
x
20
×
3
x
=
−4
×
75
x
=
−5
(13)
−9
:
−3
=
x
−
1
:
2
−3
×
(
x
−
1
)
=
−9
×
2
x
−
1
=
6
x
=
7
(14)
−2
:
x
−
3
=
2
:
−5
2
×
(
x
−
3
)
=
−2
×
(
−5
)
x
−
3
=
5
x
=
8
(15)
9
:
−3
=
12
:
x
+
3
9
×
(
x
+
3
)
=
−3
×
12
x
+
3
=
−4
x
=
−7
(16)
4
x
:
48
=
5
:
3
3
×
4
x
=
48
×
5
x
=
20