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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
:
−8
=
−15
:
−5
(2)
−10
:
2
=
60
:
4
x
(3)
2
:
1
=
−4
x
:
16
(4)
2
:
1
=
−4
:
x
−
5
(5)
5
:
x
−
5
=
−25
:
10
(6)
5
:
−4
=
15
:
x
+
2
(7)
15
:
5
x
=
−9
:
−6
(8)
−4
:
1
=
x
−
2
:
−4
(9)
−12
:
20
=
3
:
x
+
4
(10)
5
:
−3
=
−4
x
:
−12
(11)
4
:
1
=
−20
:
x
+
4
(12)
5
:
−5
=
−
x
:
10
(13)
4
:
−2
x
=
−1
:
2
(14)
x
+
3
:
4
=
−15
:
−5
(15)
5
:
25
=
−3
:
x
−
2
(16)
5
:
2
=
2
x
:
12
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−4
x
:
−8
=
−15
:
−5
−5
×
(
−4
)
x
=
−8
×
(
−15
)
x
=
6
(2)
−10
:
2
=
60
:
4
x
−10
×
4
x
=
2
×
60
x
=
−3
(3)
2
:
1
=
−4
x
:
16
−4
x
=
2
×
16
x
=
−8
(4)
2
:
1
=
−4
:
x
−
5
2
×
(
x
−
5
)
=
−4
x
−
5
=
−2
x
=
3
(5)
5
:
x
−
5
=
−25
:
10
−25
×
(
x
−
5
)
=
5
×
10
x
−
5
=
−2
x
=
3
(6)
5
:
−4
=
15
:
x
+
2
5
×
(
x
+
2
)
=
−4
×
15
x
+
2
=
−12
x
=
−14
(7)
15
:
5
x
=
−9
:
−6
−9
×
5
x
=
15
×
(
−6
)
x
=
2
(8)
−4
:
1
=
x
−
2
:
−4
x
−
2
=
−4
×
(
−4
)
x
−
2
=
16
x
=
18
(9)
−12
:
20
=
3
:
x
+
4
−12
×
(
x
+
4
)
=
20
×
3
x
+
4
=
−5
x
=
−9
(10)
5
:
−3
=
−4
x
:
−12
−3
×
(
−4
)
x
=
5
×
(
−12
)
x
=
−5
(11)
4
:
1
=
−20
:
x
+
4
4
×
(
x
+
4
)
=
−20
x
+
4
=
−5
x
=
−9
(12)
5
:
−5
=
−
x
:
10
−5
×
(
−1
)
x
=
5
×
10
x
=
10
(13)
4
:
−2
x
=
−1
:
2
−
(
−2
)
x
=
4
×
2
x
=
4
(14)
x
+
3
:
4
=
−15
:
−5
−5
×
(
x
+
3
)
=
4
×
(
−15
)
x
+
3
=
12
x
=
9
(15)
5
:
25
=
−3
:
x
−
2
5
×
(
x
−
2
)
=
25
×
(
−3
)
x
−
2
=
−15
x
=
−13
(16)
5
:
2
=
2
x
:
12
2
×
2
x
=
5
×
12
x
=
15