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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
−
5
=
−15
:
6
(2)
x
+
2
:
−20
=
−4
:
4
(3)
10
:
−5
=
−2
x
:
2
(4)
4
:
16
=
−4
:
x
−
1
(5)
−15
:
5
=
3
x
:
9
(6)
−4
:
8
=
x
+
3
:
4
(7)
20
:
x
−
4
=
−16
:
−4
(8)
−1
:
x
−
4
=
1
:
−4
(9)
25
:
−5
=
x
−
4
:
−4
(10)
3
:
1
=
x
+
2
:
3
(11)
−9
:
−12
=
3
:
x
+
4
(12)
10
:
−5
=
5
x
:
−5
(13)
−8
:
4
=
x
+
5
:
3
(14)
−5
x
:
−50
=
−3
:
6
(15)
−4
:
12
=
−1
:
x
+
4
(16)
x
−
2
:
5
=
−16
:
−4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−5
:
x
−
5
=
−15
:
6
−15
×
(
x
−
5
)
=
−5
×
6
x
−
5
=
2
x
=
7
(2)
x
+
2
:
−20
=
−4
:
4
4
×
(
x
+
2
)
=
−20
×
(
−4
)
x
+
2
=
20
x
=
18
(3)
10
:
−5
=
−2
x
:
2
−5
×
(
−2
)
x
=
10
×
2
x
=
2
(4)
4
:
16
=
−4
:
x
−
1
4
×
(
x
−
1
)
=
16
×
(
−4
)
x
−
1
=
−16
x
=
−15
(5)
−15
:
5
=
3
x
:
9
5
×
3
x
=
−15
×
9
x
=
−9
(6)
−4
:
8
=
x
+
3
:
4
8
×
(
x
+
3
)
=
−4
×
4
x
+
3
=
−2
x
=
−5
(7)
20
:
x
−
4
=
−16
:
−4
−16
×
(
x
−
4
)
=
20
×
(
−4
)
x
−
4
=
5
x
=
9
(8)
−1
:
x
−
4
=
1
:
−4
x
−
4
=
−
(
−4
)
x
−
4
=
4
x
=
8
(9)
25
:
−5
=
x
−
4
:
−4
−5
×
(
x
−
4
)
=
25
×
(
−4
)
x
−
4
=
20
x
=
24
(10)
3
:
1
=
x
+
2
:
3
x
+
2
=
3
×
3
x
+
2
=
9
x
=
7
(11)
−9
:
−12
=
3
:
x
+
4
−9
×
(
x
+
4
)
=
−12
×
3
x
+
4
=
4
x
=
0
(12)
10
:
−5
=
5
x
:
−5
−5
×
5
x
=
10
×
(
−5
)
x
=
2
(13)
−8
:
4
=
x
+
5
:
3
4
×
(
x
+
5
)
=
−8
×
3
x
+
5
=
−6
x
=
−11
(14)
−5
x
:
−50
=
−3
:
6
6
×
(
−5
)
x
=
−50
×
(
−3
)
x
=
−5
(15)
−4
:
12
=
−1
:
x
+
4
−4
×
(
x
+
4
)
=
12
×
(
−1
)
x
+
4
=
3
x
=
−1
(16)
x
−
2
:
5
=
−16
:
−4
−4
×
(
x
−
2
)
=
5
×
(
−16
)
x
−
2
=
20
x
=
22