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