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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
x
:
−24
=
5
:
15
(2)
−15
:
3
x
=
15
:
−6
(3)
9
:
3
=
−3
:
x
+
2
(4)
−24
:
−2
x
=
−4
:
−3
(5)
x
−
5
:
−6
=
−5
:
−2
(6)
4
:
−4
x
=
3
:
6
(7)
16
:
4
x
=
1
:
−1
(8)
−2
:
−2
x
=
2
:
4
(9)
25
:
5
=
20
:
x
−
3
(10)
x
−
3
:
2
=
2
:
1
(11)
−5
x
:
−25
=
3
:
−15
(12)
x
+
4
:
1
=
−8
:
2
(13)
−3
:
−12
=
x
−
5
:
8
(14)
x
−
1
:
−25
=
−3
:
−15
(15)
4
:
x
+
5
=
16
:
4
(16)
x
−
1
:
15
=
4
:
3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
4
x
:
−24
=
5
:
15
15
×
4
x
=
−24
×
5
x
=
−2
(2)
−15
:
3
x
=
15
:
−6
15
×
3
x
=
−15
×
(
−6
)
x
=
2
(3)
9
:
3
=
−3
:
x
+
2
9
×
(
x
+
2
)
=
3
×
(
−3
)
x
+
2
=
−1
x
=
−3
(4)
−24
:
−2
x
=
−4
:
−3
−4
×
(
−2
)
x
=
−24
×
(
−3
)
x
=
9
(5)
x
−
5
:
−6
=
−5
:
−2
−2
×
(
x
−
5
)
=
−6
×
(
−5
)
x
−
5
=
−15
x
=
−10
(6)
4
:
−4
x
=
3
:
6
3
×
(
−4
)
x
=
4
×
6
x
=
−2
(7)
16
:
4
x
=
1
:
−1
4
x
=
16
×
(
−1
)
x
=
−4
(8)
−2
:
−2
x
=
2
:
4
2
×
(
−2
)
x
=
−2
×
4
x
=
2
(9)
25
:
5
=
20
:
x
−
3
25
×
(
x
−
3
)
=
5
×
20
x
−
3
=
4
x
=
7
(10)
x
−
3
:
2
=
2
:
1
x
−
3
=
2
×
2
x
−
3
=
4
x
=
7
(11)
−5
x
:
−25
=
3
:
−15
−15
×
(
−5
)
x
=
−25
×
3
x
=
−1
(12)
x
+
4
:
1
=
−8
:
2
2
×
(
x
+
4
)
=
−8
x
+
4
=
−4
x
=
−8
(13)
−3
:
−12
=
x
−
5
:
8
−12
×
(
x
−
5
)
=
−3
×
8
x
−
5
=
2
x
=
7
(14)
x
−
1
:
−25
=
−3
:
−15
−15
×
(
x
−
1
)
=
−25
×
(
−3
)
x
−
1
=
−5
x
=
−4
(15)
4
:
x
+
5
=
16
:
4
16
×
(
x
+
5
)
=
4
×
4
x
+
5
=
1
x
=
−4
(16)
x
−
1
:
15
=
4
:
3
3
×
(
x
−
1
)
=
15
×
4
x
−
1
=
20
x
=
21