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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)
−4
:
2
=
−30
:
3
x
(2)
4
:
−4
=
3
:
x
−
2
(3)
−2
:
x
−
3
=
−1
:
−3
(4)
−8
:
x
+
5
=
−6
:
−3
(5)
60
:
−4
x
=
−5
:
−1
(6)
9
:
−3
x
=
4
:
−20
(7)
5
:
−
x
=
−1
:
5
(8)
−3
x
:
3
=
−16
:
−4
(9)
x
−
2
:
2
=
2
:
4
(10)
−5
:
−
x
=
−1
:
2
(11)
−8
:
−4
=
x
−
5
:
−1
(12)
6
:
x
−
3
=
2
:
−5
(13)
4
:
20
=
15
:
−5
x
(14)
x
+
3
:
−3
=
4
:
6
(15)
−125
:
5
x
=
20
:
4
(16)
−1
:
x
+
4
=
−2
:
−10
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−4
:
2
=
−30
:
3
x
−4
×
3
x
=
2
×
(
−30
)
x
=
5
(2)
4
:
−4
=
3
:
x
−
2
4
×
(
x
−
2
)
=
−4
×
3
x
−
2
=
−3
x
=
−1
(3)
−2
:
x
−
3
=
−1
:
−3
−
(
x
−
3
)
=
−2
×
(
−3
)
x
−
3
=
−6
x
=
−3
(4)
−8
:
x
+
5
=
−6
:
−3
−6
×
(
x
+
5
)
=
−8
×
(
−3
)
x
+
5
=
−4
x
=
−9
(5)
60
:
−4
x
=
−5
:
−1
−5
×
(
−4
)
x
=
60
×
(
−1
)
x
=
−3
(6)
9
:
−3
x
=
4
:
−20
4
×
(
−3
)
x
=
9
×
(
−20
)
x
=
15
(7)
5
:
−
x
=
−1
:
5
x
=
5
×
5
x
=
25
(8)
−3
x
:
3
=
−16
:
−4
−4
×
(
−3
)
x
=
3
×
(
−16
)
x
=
−4
(9)
x
−
2
:
2
=
2
:
4
4
×
(
x
−
2
)
=
2
×
2
x
−
2
=
1
x
=
3
(10)
−5
:
−
x
=
−1
:
2
x
=
−5
×
2
x
=
−10
(11)
−8
:
−4
=
x
−
5
:
−1
−4
×
(
x
−
5
)
=
−8
×
(
−1
)
x
−
5
=
−2
x
=
3
(12)
6
:
x
−
3
=
2
:
−5
2
×
(
x
−
3
)
=
6
×
(
−5
)
x
−
3
=
−15
x
=
−12
(13)
4
:
20
=
15
:
−5
x
4
×
(
−5
)
x
=
20
×
15
x
=
−15
(14)
x
+
3
:
−3
=
4
:
6
6
×
(
x
+
3
)
=
−3
×
4
x
+
3
=
−2
x
=
−5
(15)
−125
:
5
x
=
20
:
4
20
×
5
x
=
−125
×
4
x
=
−5
(16)
−1
:
x
+
4
=
−2
:
−10
−2
×
(
x
+
4
)
=
−
(
−10
)
x
+
4
=
−5
x
=
−9