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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)
−10
:
−5
x
=
−8
:
12
(2)
−5
:
10
=
−5
:
−5
x
(3)
−2
:
x
−
1
=
−4
:
2
(4)
60
:
3
x
=
−4
:
4
(5)
−16
:
−4
x
=
−16
:
−12
(6)
4
:
x
−
5
=
−2
:
−8
(7)
5
:
−
x
=
4
:
16
(8)
−2
x
:
−8
=
20
:
−16
(9)
4
:
16
=
x
+
2
:
−4
(10)
−3
:
6
=
1
:
x
+
5
(11)
−3
:
5
=
x
−
5
:
−5
(12)
−3
:
x
−
3
=
−5
:
5
(13)
4
:
−16
=
x
−
3
:
4
(14)
5
:
−5
=
5
x
:
−10
(15)
6
:
−2
=
x
−
5
:
−1
(16)
x
−
2
:
−5
=
2
:
5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−10
:
−5
x
=
−8
:
12
−8
×
(
−5
)
x
=
−10
×
12
x
=
−3
(2)
−5
:
10
=
−5
:
−5
x
−5
×
(
−5
)
x
=
10
×
(
−5
)
x
=
−2
(3)
−2
:
x
−
1
=
−4
:
2
−4
×
(
x
−
1
)
=
−2
×
2
x
−
1
=
1
x
=
2
(4)
60
:
3
x
=
−4
:
4
−4
×
3
x
=
60
×
4
x
=
−20
(5)
−16
:
−4
x
=
−16
:
−12
−16
×
(
−4
)
x
=
−16
×
(
−12
)
x
=
3
(6)
4
:
x
−
5
=
−2
:
−8
−2
×
(
x
−
5
)
=
4
×
(
−8
)
x
−
5
=
16
x
=
21
(7)
5
:
−
x
=
4
:
16
4
×
(
−1
)
x
=
5
×
16
x
=
−20
(8)
−2
x
:
−8
=
20
:
−16
−16
×
(
−2
)
x
=
−8
×
20
x
=
−5
(9)
4
:
16
=
x
+
2
:
−4
16
×
(
x
+
2
)
=
4
×
(
−4
)
x
+
2
=
−1
x
=
−3
(10)
−3
:
6
=
1
:
x
+
5
−3
×
(
x
+
5
)
=
6
x
+
5
=
−2
x
=
−7
(11)
−3
:
5
=
x
−
5
:
−5
5
×
(
x
−
5
)
=
−3
×
(
−5
)
x
−
5
=
3
x
=
8
(12)
−3
:
x
−
3
=
−5
:
5
−5
×
(
x
−
3
)
=
−3
×
5
x
−
3
=
3
x
=
6
(13)
4
:
−16
=
x
−
3
:
4
−16
×
(
x
−
3
)
=
4
×
4
x
−
3
=
−1
x
=
2
(14)
5
:
−5
=
5
x
:
−10
−5
×
5
x
=
5
×
(
−10
)
x
=
2
(15)
6
:
−2
=
x
−
5
:
−1
−2
×
(
x
−
5
)
=
6
×
(
−1
)
x
−
5
=
3
x
=
8
(16)
x
−
2
:
−5
=
2
:
5
5
×
(
x
−
2
)
=
−5
×
2
x
−
2
=
−2
x
=
0