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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
:
−12
=
−25
:
15
(2)
x
−
3
:
−2
=
3
:
2
(3)
2
:
−10
=
3
:
x
−
5
(4)
5
:
1
=
−25
:
x
−
1
(5)
−3
:
2
=
x
−
1
:
−10
(6)
5
x
:
15
=
8
:
−12
(7)
x
+
5
:
5
=
−12
:
−15
(8)
−5
x
:
−10
=
2
:
4
(9)
−6
:
2
=
−15
:
−5
x
(10)
9
:
3
=
x
−
2
:
−5
(11)
2
:
−8
=
4
:
4
x
(12)
2
:
x
−
4
=
−5
:
15
(13)
5
:
−5
=
−25
:
x
−
1
(14)
6
:
3
=
3
x
:
−12
(15)
−5
x
:
−25
=
−1
:
1
(16)
−5
:
2
=
20
:
x
−
2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−4
x
:
−12
=
−25
:
15
15
×
(
−4
)
x
=
−12
×
(
−25
)
x
=
−5
(2)
x
−
3
:
−2
=
3
:
2
2
×
(
x
−
3
)
=
−2
×
3
x
−
3
=
−3
x
=
0
(3)
2
:
−10
=
3
:
x
−
5
2
×
(
x
−
5
)
=
−10
×
3
x
−
5
=
−15
x
=
−10
(4)
5
:
1
=
−25
:
x
−
1
5
×
(
x
−
1
)
=
−25
x
−
1
=
−5
x
=
−4
(5)
−3
:
2
=
x
−
1
:
−10
2
×
(
x
−
1
)
=
−3
×
(
−10
)
x
−
1
=
15
x
=
16
(6)
5
x
:
15
=
8
:
−12
−12
×
5
x
=
15
×
8
x
=
−2
(7)
x
+
5
:
5
=
−12
:
−15
−15
×
(
x
+
5
)
=
5
×
(
−12
)
x
+
5
=
4
x
=
−1
(8)
−5
x
:
−10
=
2
:
4
4
×
(
−5
)
x
=
−10
×
2
x
=
1
(9)
−6
:
2
=
−15
:
−5
x
−6
×
(
−5
)
x
=
2
×
(
−15
)
x
=
−1
(10)
9
:
3
=
x
−
2
:
−5
3
×
(
x
−
2
)
=
9
×
(
−5
)
x
−
2
=
−15
x
=
−13
(11)
2
:
−8
=
4
:
4
x
2
×
4
x
=
−8
×
4
x
=
−4
(12)
2
:
x
−
4
=
−5
:
15
−5
×
(
x
−
4
)
=
2
×
15
x
−
4
=
−6
x
=
−2
(13)
5
:
−5
=
−25
:
x
−
1
5
×
(
x
−
1
)
=
−5
×
(
−25
)
x
−
1
=
25
x
=
26
(14)
6
:
3
=
3
x
:
−12
3
×
3
x
=
6
×
(
−12
)
x
=
−8
(15)
−5
x
:
−25
=
−1
:
1
−5
x
=
−25
×
(
−1
)
x
=
−5
(16)
−5
:
2
=
20
:
x
−
2
−5
×
(
x
−
2
)
=
2
×
20
x
−
2
=
−8
x
=
−6