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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)
x
−
5
:
4
=
4
:
−1
(2)
−5
:
1
=
3
x
:
15
(3)
10
:
15
=
x
−
5
:
3
(4)
64
:
4
x
=
−8
:
−2
(5)
−3
:
6
=
6
:
−3
x
(6)
x
+
4
:
−12
=
−1
:
−4
(7)
5
:
x
−
1
=
25
:
20
(8)
12
:
4
x
=
−15
:
5
(9)
−4
:
−8
=
2
x
:
4
(10)
−9
:
3
=
3
:
x
−
5
(11)
−5
x
:
20
=
−8
:
4
(12)
−18
:
3
x
=
−3
:
3
(13)
−3
x
:
−45
=
−3
:
−9
(14)
x
−
5
:
3
=
−25
:
5
(15)
−6
:
2
x
=
4
:
8
(16)
−6
:
−10
=
6
:
−2
x
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
−
5
:
4
=
4
:
−1
−
(
x
−
5
)
=
4
×
4
x
−
5
=
−16
x
=
−11
(2)
−5
:
1
=
3
x
:
15
3
x
=
−5
×
15
x
=
−25
(3)
10
:
15
=
x
−
5
:
3
15
×
(
x
−
5
)
=
10
×
3
x
−
5
=
2
x
=
7
(4)
64
:
4
x
=
−8
:
−2
−8
×
4
x
=
64
×
(
−2
)
x
=
4
(5)
−3
:
6
=
6
:
−3
x
−3
×
(
−3
)
x
=
6
×
6
x
=
4
(6)
x
+
4
:
−12
=
−1
:
−4
−4
×
(
x
+
4
)
=
−12
×
(
−1
)
x
+
4
=
−3
x
=
−7
(7)
5
:
x
−
1
=
25
:
20
25
×
(
x
−
1
)
=
5
×
20
x
−
1
=
4
x
=
5
(8)
12
:
4
x
=
−15
:
5
−15
×
4
x
=
12
×
5
x
=
−1
(9)
−4
:
−8
=
2
x
:
4
−8
×
2
x
=
−4
×
4
x
=
1
(10)
−9
:
3
=
3
:
x
−
5
−9
×
(
x
−
5
)
=
3
×
3
x
−
5
=
−1
x
=
4
(11)
−5
x
:
20
=
−8
:
4
4
×
(
−5
)
x
=
20
×
(
−8
)
x
=
8
(12)
−18
:
3
x
=
−3
:
3
−3
×
3
x
=
−18
×
3
x
=
6
(13)
−3
x
:
−45
=
−3
:
−9
−9
×
(
−3
)
x
=
−45
×
(
−3
)
x
=
5
(14)
x
−
5
:
3
=
−25
:
5
5
×
(
x
−
5
)
=
3
×
(
−25
)
x
−
5
=
−15
x
=
−10
(15)
−6
:
2
x
=
4
:
8
4
×
2
x
=
−6
×
8
x
=
−6
(16)
−6
:
−10
=
6
:
−2
x
−6
×
(
−2
)
x
=
−10
×
6
x
=
−5