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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)
−8
:
−4
x
=
−3
:
3
(2)
−3
:
3
x
=
1
:
−5
(3)
−1
:
x
−
1
=
−2
:
2
(4)
3
:
−3
=
−6
:
2
x
(5)
2
:
5
=
−20
:
−2
x
(6)
−8
:
6
=
−3
x
:
9
(7)
4
:
−8
=
4
:
−2
x
(8)
5
:
1
=
−25
:
5
x
(9)
12
:
−15
=
4
:
x
−
2
(10)
−36
:
−3
x
=
4
:
−1
(11)
−1
:
−3
=
−3
:
−
x
(12)
x
+
2
:
−4
=
−3
:
4
(13)
3
:
−3
=
48
:
−4
x
(14)
−4
:
3
=
−20
:
−5
x
(15)
x
+
2
:
−1
=
−4
:
4
(16)
−20
:
−5
=
−16
:
x
+
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−8
:
−4
x
=
−3
:
3
−3
×
(
−4
)
x
=
−8
×
3
x
=
−2
(2)
−3
:
3
x
=
1
:
−5
3
x
=
−3
×
(
−5
)
x
=
5
(3)
−1
:
x
−
1
=
−2
:
2
−2
×
(
x
−
1
)
=
−
2
x
−
1
=
1
x
=
2
(4)
3
:
−3
=
−6
:
2
x
3
×
2
x
=
−3
×
(
−6
)
x
=
3
(5)
2
:
5
=
−20
:
−2
x
2
×
(
−2
)
x
=
5
×
(
−20
)
x
=
25
(6)
−8
:
6
=
−3
x
:
9
6
×
(
−3
)
x
=
−8
×
9
x
=
4
(7)
4
:
−8
=
4
:
−2
x
4
×
(
−2
)
x
=
−8
×
4
x
=
4
(8)
5
:
1
=
−25
:
5
x
5
×
5
x
=
−25
x
=
−1
(9)
12
:
−15
=
4
:
x
−
2
12
×
(
x
−
2
)
=
−15
×
4
x
−
2
=
−5
x
=
−3
(10)
−36
:
−3
x
=
4
:
−1
4
×
(
−3
)
x
=
−36
×
(
−1
)
x
=
−3
(11)
−1
:
−3
=
−3
:
−
x
x
=
−3
×
(
−3
)
x
=
9
(12)
x
+
2
:
−4
=
−3
:
4
4
×
(
x
+
2
)
=
−4
×
(
−3
)
x
+
2
=
3
x
=
1
(13)
3
:
−3
=
48
:
−4
x
3
×
(
−4
)
x
=
−3
×
48
x
=
12
(14)
−4
:
3
=
−20
:
−5
x
−4
×
(
−5
)
x
=
3
×
(
−20
)
x
=
−3
(15)
x
+
2
:
−1
=
−4
:
4
4
×
(
x
+
2
)
=
−
(
−4
)
x
+
2
=
1
x
=
−1
(16)
−20
:
−5
=
−16
:
x
+
4
−20
×
(
x
+
4
)
=
−5
×
(
−16
)
x
+
4
=
−4
x
=
−8