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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
=
x
+
5
:
−3
(2)
5
:
−2
=
75
:
−3
x
(3)
5
:
20
=
−
x
:
−4
(4)
−3
:
12
=
12
:
−3
x
(5)
−2
:
−5
=
4
x
:
80
(6)
3
x
:
3
=
6
:
−2
(7)
−2
:
x
+
3
=
1
:
−4
(8)
−10
:
x
+
2
=
−15
:
3
(9)
x
+
4
:
−20
=
1
:
−4
(10)
4
:
x
−
4
=
−2
:
2
(11)
−3
:
x
+
2
=
3
:
1
(12)
x
+
4
:
3
=
−20
:
5
(13)
60
:
−4
x
=
−5
:
−3
(14)
−5
:
−
x
=
3
:
−6
(15)
2
:
−1
=
−8
:
x
+
2
(16)
5
:
x
+
4
=
2
:
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
1
:
3
=
x
+
5
:
−3
3
×
(
x
+
5
)
=
−3
x
+
5
=
−1
x
=
−6
(2)
5
:
−2
=
75
:
−3
x
5
×
(
−3
)
x
=
−2
×
75
x
=
10
(3)
5
:
20
=
−
x
:
−4
20
×
(
−1
)
x
=
5
×
(
−4
)
x
=
1
(4)
−3
:
12
=
12
:
−3
x
−3
×
(
−3
)
x
=
12
×
12
x
=
16
(5)
−2
:
−5
=
4
x
:
80
−5
×
4
x
=
−2
×
80
x
=
8
(6)
3
x
:
3
=
6
:
−2
−2
×
3
x
=
3
×
6
x
=
−3
(7)
−2
:
x
+
3
=
1
:
−4
x
+
3
=
−2
×
(
−4
)
x
+
3
=
8
x
=
5
(8)
−10
:
x
+
2
=
−15
:
3
−15
×
(
x
+
2
)
=
−10
×
3
x
+
2
=
2
x
=
0
(9)
x
+
4
:
−20
=
1
:
−4
−4
×
(
x
+
4
)
=
−20
x
+
4
=
5
x
=
1
(10)
4
:
x
−
4
=
−2
:
2
−2
×
(
x
−
4
)
=
4
×
2
x
−
4
=
−4
x
=
0
(11)
−3
:
x
+
2
=
3
:
1
3
×
(
x
+
2
)
=
−3
x
+
2
=
−1
x
=
−3
(12)
x
+
4
:
3
=
−20
:
5
5
×
(
x
+
4
)
=
3
×
(
−20
)
x
+
4
=
−12
x
=
−16
(13)
60
:
−4
x
=
−5
:
−3
−5
×
(
−4
)
x
=
60
×
(
−3
)
x
=
−9
(14)
−5
:
−
x
=
3
:
−6
3
×
(
−1
)
x
=
−5
×
(
−6
)
x
=
−10
(15)
2
:
−1
=
−8
:
x
+
2
2
×
(
x
+
2
)
=
−
(
−8
)
x
+
2
=
4
x
=
2
(16)
5
:
x
+
4
=
2
:
4
2
×
(
x
+
4
)
=
5
×
4
x
+
4
=
10
x
=
6