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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)
−20
:
15
=
x
−
1
:
3
(2)
−2
x
:
−24
=
−2
:
−3
(3)
x
−
2
:
2
=
25
:
−5
(4)
3
x
:
−6
=
−12
:
−8
(5)
x
+
5
:
−1
=
9
:
3
(6)
60
:
−4
x
=
−5
:
5
(7)
12
:
4
=
−4
x
:
−12
(8)
30
:
−3
x
=
15
:
−3
(9)
1
:
4
=
−4
:
4
x
(10)
5
:
3
=
4
x
:
−36
(11)
x
−
4
:
10
=
2
:
5
(12)
x
−
2
:
−4
=
−1
:
1
(13)
4
:
−2
x
=
−8
:
20
(14)
3
x
:
60
=
1
:
−5
(15)
−4
x
:
12
=
20
:
5
(16)
6
:
−10
=
3
:
x
+
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−20
:
15
=
x
−
1
:
3
15
×
(
x
−
1
)
=
−20
×
3
x
−
1
=
−4
x
=
−3
(2)
−2
x
:
−24
=
−2
:
−3
−3
×
(
−2
)
x
=
−24
×
(
−2
)
x
=
8
(3)
x
−
2
:
2
=
25
:
−5
−5
×
(
x
−
2
)
=
2
×
25
x
−
2
=
−10
x
=
−8
(4)
3
x
:
−6
=
−12
:
−8
−8
×
3
x
=
−6
×
(
−12
)
x
=
−3
(5)
x
+
5
:
−1
=
9
:
3
3
×
(
x
+
5
)
=
−
9
x
+
5
=
−3
x
=
−8
(6)
60
:
−4
x
=
−5
:
5
−5
×
(
−4
)
x
=
60
×
5
x
=
15
(7)
12
:
4
=
−4
x
:
−12
4
×
(
−4
)
x
=
12
×
(
−12
)
x
=
9
(8)
30
:
−3
x
=
15
:
−3
15
×
(
−3
)
x
=
30
×
(
−3
)
x
=
2
(9)
1
:
4
=
−4
:
4
x
4
x
=
4
×
(
−4
)
x
=
−4
(10)
5
:
3
=
4
x
:
−36
3
×
4
x
=
5
×
(
−36
)
x
=
−15
(11)
x
−
4
:
10
=
2
:
5
5
×
(
x
−
4
)
=
10
×
2
x
−
4
=
4
x
=
8
(12)
x
−
2
:
−4
=
−1
:
1
x
−
2
=
−4
×
(
−1
)
x
−
2
=
4
x
=
6
(13)
4
:
−2
x
=
−8
:
20
−8
×
(
−2
)
x
=
4
×
20
x
=
5
(14)
3
x
:
60
=
1
:
−5
−5
×
3
x
=
60
x
=
−4
(15)
−4
x
:
12
=
20
:
5
5
×
(
−4
)
x
=
12
×
20
x
=
−12
(16)
6
:
−10
=
3
:
x
+
4
6
×
(
x
+
4
)
=
−10
×
3
x
+
4
=
−5
x
=
−9