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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)
x
+
3
:
1
=
−4
:
−2
(2)
−1
:
−2
=
5
x
:
10
(3)
−4
x
:
4
=
2
:
−2
(4)
x
−
5
:
12
=
−5
:
−20
(5)
−3
:
6
=
−4
:
−4
x
(6)
x
−
4
:
2
=
15
:
−5
(7)
4
:
8
=
−2
:
x
+
3
(8)
5
:
x
−
5
=
−1
:
3
(9)
−5
:
−1
=
x
−
4
:
−3
(10)
−4
:
x
+
5
=
20
:
15
(11)
−5
:
x
−
3
=
5
:
1
(12)
−2
:
−1
=
x
+
4
:
1
(13)
−5
x
:
−40
=
−3
:
6
(14)
20
:
x
−
3
=
5
:
−1
(15)
−3
x
:
−30
=
−4
:
−8
(16)
2
:
−
x
=
10
:
5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
+
3
:
1
=
−4
:
−2
−2
×
(
x
+
3
)
=
−4
x
+
3
=
2
x
=
−1
(2)
−1
:
−2
=
5
x
:
10
−2
×
5
x
=
−
10
x
=
1
(3)
−4
x
:
4
=
2
:
−2
−2
×
(
−4
)
x
=
4
×
2
x
=
1
(4)
x
−
5
:
12
=
−5
:
−20
−20
×
(
x
−
5
)
=
12
×
(
−5
)
x
−
5
=
3
x
=
8
(5)
−3
:
6
=
−4
:
−4
x
−3
×
(
−4
)
x
=
6
×
(
−4
)
x
=
−2
(6)
x
−
4
:
2
=
15
:
−5
−5
×
(
x
−
4
)
=
2
×
15
x
−
4
=
−6
x
=
−2
(7)
4
:
8
=
−2
:
x
+
3
4
×
(
x
+
3
)
=
8
×
(
−2
)
x
+
3
=
−4
x
=
−7
(8)
5
:
x
−
5
=
−1
:
3
−
(
x
−
5
)
=
5
×
3
x
−
5
=
−15
x
=
−10
(9)
−5
:
−1
=
x
−
4
:
−3
−
(
x
−
4
)
=
−5
×
(
−3
)
x
−
4
=
−15
x
=
−11
(10)
−4
:
x
+
5
=
20
:
15
20
×
(
x
+
5
)
=
−4
×
15
x
+
5
=
−3
x
=
−8
(11)
−5
:
x
−
3
=
5
:
1
5
×
(
x
−
3
)
=
−5
x
−
3
=
−1
x
=
2
(12)
−2
:
−1
=
x
+
4
:
1
−
(
x
+
4
)
=
−2
x
+
4
=
2
x
=
−2
(13)
−5
x
:
−40
=
−3
:
6
6
×
(
−5
)
x
=
−40
×
(
−3
)
x
=
−4
(14)
20
:
x
−
3
=
5
:
−1
5
×
(
x
−
3
)
=
20
×
(
−1
)
x
−
3
=
−4
x
=
−1
(15)
−3
x
:
−30
=
−4
:
−8
−8
×
(
−3
)
x
=
−30
×
(
−4
)
x
=
5
(16)
2
:
−
x
=
10
:
5
10
×
(
−1
)
x
=
2
×
5
x
=
−1