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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
:
20
=
−4
x
:
−32
(2)
−1
:
2
=
3
:
x
+
3
(3)
5
x
:
25
=
4
:
−10
(4)
−5
:
−2
=
20
:
−2
x
(5)
5
:
−5
x
=
−3
:
−6
(6)
4
:
x
+
4
=
−4
:
5
(7)
x
−
3
:
−2
=
4
:
−1
(8)
6
:
2
x
=
5
:
−5
(9)
−24
:
−2
x
=
3
:
4
(10)
25
:
5
=
−2
x
:
−8
(11)
1
:
2
=
x
−
3
:
−4
(12)
−10
:
−5
=
−4
:
−
x
(13)
8
:
4
=
−2
:
x
−
4
(14)
−20
:
16
=
x
+
4
:
4
(15)
−4
:
6
=
−2
:
x
−
2
(16)
1
:
2
=
−4
:
2
x
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−5
:
20
=
−4
x
:
−32
20
×
(
−4
)
x
=
−5
×
(
−32
)
x
=
−2
(2)
−1
:
2
=
3
:
x
+
3
−
(
x
+
3
)
=
2
×
3
x
+
3
=
−6
x
=
−9
(3)
5
x
:
25
=
4
:
−10
−10
×
5
x
=
25
×
4
x
=
−2
(4)
−5
:
−2
=
20
:
−2
x
−5
×
(
−2
)
x
=
−2
×
20
x
=
−4
(5)
5
:
−5
x
=
−3
:
−6
−3
×
(
−5
)
x
=
5
×
(
−6
)
x
=
−2
(6)
4
:
x
+
4
=
−4
:
5
−4
×
(
x
+
4
)
=
4
×
5
x
+
4
=
−5
x
=
−9
(7)
x
−
3
:
−2
=
4
:
−1
−
(
x
−
3
)
=
−2
×
4
x
−
3
=
8
x
=
11
(8)
6
:
2
x
=
5
:
−5
5
×
2
x
=
6
×
(
−5
)
x
=
−3
(9)
−24
:
−2
x
=
3
:
4
3
×
(
−2
)
x
=
−24
×
4
x
=
16
(10)
25
:
5
=
−2
x
:
−8
5
×
(
−2
)
x
=
25
×
(
−8
)
x
=
20
(11)
1
:
2
=
x
−
3
:
−4
2
×
(
x
−
3
)
=
−4
x
−
3
=
−2
x
=
1
(12)
−10
:
−5
=
−4
:
−
x
−10
×
(
−1
)
x
=
−5
×
(
−4
)
x
=
2
(13)
8
:
4
=
−2
:
x
−
4
8
×
(
x
−
4
)
=
4
×
(
−2
)
x
−
4
=
−1
x
=
3
(14)
−20
:
16
=
x
+
4
:
4
16
×
(
x
+
4
)
=
−20
×
4
x
+
4
=
−5
x
=
−9
(15)
−4
:
6
=
−2
:
x
−
2
−4
×
(
x
−
2
)
=
6
×
(
−2
)
x
−
2
=
3
x
=
5
(16)
1
:
2
=
−4
:
2
x
2
x
=
2
×
(
−4
)
x
=
−4