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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)
9
:
x
−
4
=
−3
:
5
(2)
3
x
:
−15
=
20
:
4
(3)
−16
:
−4
=
3
x
:
−15
(4)
−4
x
:
8
=
−15
:
−6
(5)
−2
x
:
4
=
12
:
8
(6)
2
:
−6
=
4
:
4
x
(7)
6
:
−2
=
x
+
5
:
−1
(8)
10
:
5
x
=
3
:
9
(9)
−25
:
15
=
5
:
x
−
3
(10)
5
:
20
=
−5
:
x
−
2
(11)
−4
:
−4
x
=
−2
:
2
(12)
−12
:
4
x
=
9
:
−15
(13)
2
:
−6
=
−1
:
x
−
1
(14)
−4
:
8
=
4
x
:
−40
(15)
−8
:
2
x
=
5
:
10
(16)
−
x
:
6
=
−4
:
3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
9
:
x
−
4
=
−3
:
5
−3
×
(
x
−
4
)
=
9
×
5
x
−
4
=
−15
x
=
−11
(2)
3
x
:
−15
=
20
:
4
4
×
3
x
=
−15
×
20
x
=
−25
(3)
−16
:
−4
=
3
x
:
−15
−4
×
3
x
=
−16
×
(
−15
)
x
=
−20
(4)
−4
x
:
8
=
−15
:
−6
−6
×
(
−4
)
x
=
8
×
(
−15
)
x
=
−5
(5)
−2
x
:
4
=
12
:
8
8
×
(
−2
)
x
=
4
×
12
x
=
−3
(6)
2
:
−6
=
4
:
4
x
2
×
4
x
=
−6
×
4
x
=
−3
(7)
6
:
−2
=
x
+
5
:
−1
−2
×
(
x
+
5
)
=
6
×
(
−1
)
x
+
5
=
3
x
=
−2
(8)
10
:
5
x
=
3
:
9
3
×
5
x
=
10
×
9
x
=
6
(9)
−25
:
15
=
5
:
x
−
3
−25
×
(
x
−
3
)
=
15
×
5
x
−
3
=
−3
x
=
0
(10)
5
:
20
=
−5
:
x
−
2
5
×
(
x
−
2
)
=
20
×
(
−5
)
x
−
2
=
−20
x
=
−18
(11)
−4
:
−4
x
=
−2
:
2
−2
×
(
−4
)
x
=
−4
×
2
x
=
−1
(12)
−12
:
4
x
=
9
:
−15
9
×
4
x
=
−12
×
(
−15
)
x
=
5
(13)
2
:
−6
=
−1
:
x
−
1
2
×
(
x
−
1
)
=
−6
×
(
−1
)
x
−
1
=
3
x
=
4
(14)
−4
:
8
=
4
x
:
−40
8
×
4
x
=
−4
×
(
−40
)
x
=
5
(15)
−8
:
2
x
=
5
:
10
5
×
2
x
=
−8
×
10
x
=
−8
(16)
−
x
:
6
=
−4
:
3
3
×
(
−1
)
x
=
6
×
(
−4
)
x
=
8