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©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の比例式を解きなさい
[0G2-00]
(1)
−6
−
x
:
8
=
x
:
4
(2)
x
+
3
:
−20
=
x
:
−5
(3)
−15
:
x
−
3
=
−6
:
x
(4)
8
:
20
=
x
:
7
−
x
(5)
x
:
x
−
3
=
−8
:
−4
(6)
x
:
2
−
x
=
−9
:
3
(7)
x
−
2
:
x
=
1
:
2
(8)
−4
:
x
=
−16
:
x
+
3
(9)
−1
:
8
−
x
=
5
:
x
(10)
5
:
−20
=
9
−
x
:
x
(11)
−6
:
−12
=
x
:
x
−
2
(12)
x
:
−10
=
x
+
3
:
−5
(13)
x
−
3
:
−25
=
x
:
−10
(14)
−4
:
x
+
15
=
1
:
x
(15)
2
:
x
+
1
=
4
:
x
(16)
x
:
x
−
15
=
−4
:
2
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−6
−
x
:
8
=
x
:
4
4
(
−6
−
x
)
=
8
x
−24
−
4
x
=
8
x
x
=
−2
(2)
x
+
3
:
−20
=
x
:
−5
−5
(
x
+
3
)
=
−20
x
−5
x
−
15
=
−20
x
x
=
1
(3)
−15
:
x
−
3
=
−6
:
x
−6
(
x
−
3
)
=
−15
x
−6
x
+
18
=
−15
x
x
=
−2
(4)
8
:
20
=
x
:
7
−
x
8
(
7
−
x
)
=
20
x
56
−
8
x
=
20
x
x
=
2
(5)
x
:
x
−
3
=
−8
:
−4
−4
x
=
−8
(
x
−
3
)
−4
x
=
−8
x
+
24
x
=
6
(6)
x
:
2
−
x
=
−9
:
3
3
x
=
−9
(
2
−
x
)
3
x
=
−18
+
9
x
x
=
3
(7)
x
−
2
:
x
=
1
:
2
2
(
x
−
2
)
=
x
2
x
−
4
=
x
x
=
4
(8)
−4
:
x
=
−16
:
x
+
3
−4
(
x
+
3
)
=
−16
x
−4
x
−
12
=
−16
x
x
=
1
(9)
−1
:
8
−
x
=
5
:
x
5
(
8
−
x
)
=
−
x
40
−
5
x
=
−
x
x
=
10
(10)
5
:
−20
=
9
−
x
:
x
−20
(
9
−
x
)
=
5
x
−180
+
20
x
=
5
x
x
=
12
(11)
−6
:
−12
=
x
:
x
−
2
−6
(
x
−
2
)
=
−12
x
−6
x
+
12
=
−12
x
x
=
−2
(12)
x
:
−10
=
x
+
3
:
−5
−5
x
=
−10
(
x
+
3
)
−5
x
=
−10
x
−
30
x
=
−6
(13)
x
−
3
:
−25
=
x
:
−10
−10
(
x
−
3
)
=
−25
x
−10
x
+
30
=
−25
x
x
=
−2
(14)
−4
:
x
+
15
=
1
:
x
x
+
15
=
−4
x
x
+
15
=
−4
x
x
=
−3
(15)
2
:
x
+
1
=
4
:
x
4
(
x
+
1
)
=
2
x
4
x
+
4
=
2
x
x
=
−2
(16)
x
:
x
−
15
=
−4
:
2
2
x
=
−4
(
x
−
15
)
2
x
=
−4
x
+
60
x
=
10