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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)
5
x
:
−60
=
−4
:
16
(2)
−2
:
x
−
5
=
2
:
−5
(3)
−10
:
5
x
=
−8
:
20
(4)
−3
:
−
x
=
15
:
20
(5)
x
−
2
:
−1
=
−25
:
5
(6)
−1
:
x
−
4
=
1
:
5
(7)
−5
:
4
=
4
x
:
−16
(8)
x
+
5
:
−20
=
4
:
−16
(9)
−5
x
:
−60
=
−4
:
−3
(10)
5
:
2
=
15
:
x
+
5
(11)
−5
x
:
50
=
3
:
5
(12)
−5
:
5
=
2
x
:
−4
(13)
−8
:
12
=
8
:
−4
x
(14)
−6
:
−10
=
2
x
:
−10
(15)
−9
:
3
x
=
1
:
−4
(16)
4
x
:
16
=
9
:
12
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
5
x
:
−60
=
−4
:
16
16
×
5
x
=
−60
×
(
−4
)
x
=
3
(2)
−2
:
x
−
5
=
2
:
−5
2
×
(
x
−
5
)
=
−2
×
(
−5
)
x
−
5
=
5
x
=
10
(3)
−10
:
5
x
=
−8
:
20
−8
×
5
x
=
−10
×
20
x
=
5
(4)
−3
:
−
x
=
15
:
20
15
×
(
−1
)
x
=
−3
×
20
x
=
4
(5)
x
−
2
:
−1
=
−25
:
5
5
×
(
x
−
2
)
=
−
(
−25
)
x
−
2
=
5
x
=
7
(6)
−1
:
x
−
4
=
1
:
5
x
−
4
=
−
5
x
−
4
=
−5
x
=
−1
(7)
−5
:
4
=
4
x
:
−16
4
×
4
x
=
−5
×
(
−16
)
x
=
5
(8)
x
+
5
:
−20
=
4
:
−16
−16
×
(
x
+
5
)
=
−20
×
4
x
+
5
=
5
x
=
0
(9)
−5
x
:
−60
=
−4
:
−3
−3
×
(
−5
)
x
=
−60
×
(
−4
)
x
=
16
(10)
5
:
2
=
15
:
x
+
5
5
×
(
x
+
5
)
=
2
×
15
x
+
5
=
6
x
=
1
(11)
−5
x
:
50
=
3
:
5
5
×
(
−5
)
x
=
50
×
3
x
=
−6
(12)
−5
:
5
=
2
x
:
−4
5
×
2
x
=
−5
×
(
−4
)
x
=
2
(13)
−8
:
12
=
8
:
−4
x
−8
×
(
−4
)
x
=
12
×
8
x
=
3
(14)
−6
:
−10
=
2
x
:
−10
−10
×
2
x
=
−6
×
(
−10
)
x
=
−3
(15)
−9
:
3
x
=
1
:
−4
3
x
=
−9
×
(
−4
)
x
=
12
(16)
4
x
:
16
=
9
:
12
12
×
4
x
=
16
×
9
x
=
3