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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
:
25
=
−16
:
20
(2)
x
−
1
:
10
=
−1
:
5
(3)
−4
:
−3
=
−32
:
4
x
(4)
−6
:
6
=
−6
:
2
x
(5)
1
:
−1
=
−4
:
x
−
4
(6)
1
:
2
=
−2
x
:
−8
(7)
−5
:
x
−
5
=
−25
:
5
(8)
−2
:
−3
=
−2
x
:
−12
(9)
40
:
−2
x
=
−5
:
2
(10)
5
:
10
=
x
−
5
:
4
(11)
5
:
x
−
5
=
20
:
−20
(12)
6
:
3
x
=
−6
:
−3
(13)
4
:
8
=
3
:
x
+
4
(14)
−1
:
4
=
3
x
:
−12
(15)
−4
:
−8
=
x
−
1
:
2
(16)
x
+
4
:
3
=
1
:
−3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−5
x
:
25
=
−16
:
20
20
×
(
−5
)
x
=
25
×
(
−16
)
x
=
4
(2)
x
−
1
:
10
=
−1
:
5
5
×
(
x
−
1
)
=
10
×
(
−1
)
x
−
1
=
−2
x
=
−1
(3)
−4
:
−3
=
−32
:
4
x
−4
×
4
x
=
−3
×
(
−32
)
x
=
−6
(4)
−6
:
6
=
−6
:
2
x
−6
×
2
x
=
6
×
(
−6
)
x
=
3
(5)
1
:
−1
=
−4
:
x
−
4
x
−
4
=
−
(
−4
)
x
−
4
=
4
x
=
8
(6)
1
:
2
=
−2
x
:
−8
2
×
(
−2
)
x
=
−8
x
=
2
(7)
−5
:
x
−
5
=
−25
:
5
−25
×
(
x
−
5
)
=
−5
×
5
x
−
5
=
1
x
=
6
(8)
−2
:
−3
=
−2
x
:
−12
−3
×
(
−2
)
x
=
−2
×
(
−12
)
x
=
4
(9)
40
:
−2
x
=
−5
:
2
−5
×
(
−2
)
x
=
40
×
2
x
=
8
(10)
5
:
10
=
x
−
5
:
4
10
×
(
x
−
5
)
=
5
×
4
x
−
5
=
2
x
=
7
(11)
5
:
x
−
5
=
20
:
−20
20
×
(
x
−
5
)
=
5
×
(
−20
)
x
−
5
=
−5
x
=
0
(12)
6
:
3
x
=
−6
:
−3
−6
×
3
x
=
6
×
(
−3
)
x
=
1
(13)
4
:
8
=
3
:
x
+
4
4
×
(
x
+
4
)
=
8
×
3
x
+
4
=
6
x
=
2
(14)
−1
:
4
=
3
x
:
−12
4
×
3
x
=
−
(
−12
)
x
=
1
(15)
−4
:
−8
=
x
−
1
:
2
−8
×
(
x
−
1
)
=
−4
×
2
x
−
1
=
1
x
=
2
(16)
x
+
4
:
3
=
1
:
−3
−3
×
(
x
+
4
)
=
3
x
+
4
=
−1
x
=
−5