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©2024 数学クラブ http://sugaku.club/
月 日( )
● 次の比例式を解きなさい
[0G2-00]
(1)
x
:
20
=
−3
−
x
:
−5
(2)
x
−
10
:
x
=
−20
:
5
(3)
x
:
−2
=
−9
−
x
:
−1
(4)
−20
:
x
=
−15
:
x
+
1
(5)
−16
:
−20
=
x
:
9
−
x
(6)
−3
:
−15
=
x
:
x
−
4
(7)
x
:
2
−
x
=
−9
:
15
(8)
−5
:
x
=
4
:
−4
−
x
(9)
8
:
x
=
4
:
x
−
5
(10)
14
−
x
:
−2
=
x
:
−5
(11)
2
:
x
=
8
:
x
−
3
(12)
x
+
8
:
1
=
x
:
−3
(13)
20
:
25
=
x
+
1
:
x
(14)
−4
:
x
=
12
:
4
−
x
(15)
4
:
x
+
4
=
−12
:
x
(16)
6
:
−8
=
−1
−
x
:
x
©2024 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
:
20
=
−3
−
x
:
−5
−5
x
=
20
(
−3
−
x
)
−5
x
=
−60
−
20
x
x
=
−4
(2)
x
−
10
:
x
=
−20
:
5
5
(
x
−
10
)
=
−20
x
5
x
−
50
=
−20
x
x
=
2
(3)
x
:
−2
=
−9
−
x
:
−1
−
x
=
−2
(
−9
−
x
)
−
x
=
18
+
2
x
x
=
−6
(4)
−20
:
x
=
−15
:
x
+
1
−20
(
x
+
1
)
=
−15
x
−20
x
−
20
=
−15
x
x
=
−4
(5)
−16
:
−20
=
x
:
9
−
x
−16
(
9
−
x
)
=
−20
x
−144
+
16
x
=
−20
x
x
=
4
(6)
−3
:
−15
=
x
:
x
−
4
−3
(
x
−
4
)
=
−15
x
−3
x
+
12
=
−15
x
x
=
−1
(7)
x
:
2
−
x
=
−9
:
15
15
x
=
−9
(
2
−
x
)
15
x
=
−18
+
9
x
x
=
−3
(8)
−5
:
x
=
4
:
−4
−
x
−5
(
−4
−
x
)
=
4
x
20
+
5
x
=
4
x
x
=
−20
(9)
8
:
x
=
4
:
x
−
5
8
(
x
−
5
)
=
4
x
8
x
−
40
=
4
x
x
=
10
(10)
14
−
x
:
−2
=
x
:
−5
−5
(
14
−
x
)
=
−2
x
−70
+
5
x
=
−2
x
x
=
10
(11)
2
:
x
=
8
:
x
−
3
2
(
x
−
3
)
=
8
x
2
x
−
6
=
8
x
x
=
−1
(12)
x
+
8
:
1
=
x
:
−3
−3
(
x
+
8
)
=
x
−3
x
−
24
=
x
x
=
−6
(13)
20
:
25
=
x
+
1
:
x
25
(
x
+
1
)
=
20
x
25
x
+
25
=
20
x
x
=
−5
(14)
−4
:
x
=
12
:
4
−
x
−4
(
4
−
x
)
=
12
x
−16
+
4
x
=
12
x
x
=
−2
(15)
4
:
x
+
4
=
−12
:
x
−12
(
x
+
4
)
=
4
x
−12
x
−
48
=
4
x
x
=
−3
(16)
6
:
−8
=
−1
−
x
:
x
−8
(
−1
−
x
)
=
6
x
8
+
8
x
=
6
x
x
=
−4