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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
:
−5
=
20
:
x
+
4
(2)
12
:
−3
x
=
1
:
−5
(3)
5
:
−3
=
60
:
−4
x
(4)
25
:
x
+
2
=
−5
:
−2
(5)
−9
:
3
=
−
x
:
−4
(6)
−5
x
:
60
=
−2
:
6
(7)
50
:
5
x
=
−8
:
−4
(8)
5
:
1
=
−60
:
4
x
(9)
9
:
−3
=
−9
:
x
+
3
(10)
−12
:
−4
=
x
+
2
:
−5
(11)
2
:
8
=
−5
:
x
+
5
(12)
25
:
20
=
−3
x
:
−12
(13)
25
:
x
+
4
=
−20
:
4
(14)
−
x
:
−1
=
5
:
−5
(15)
4
x
:
−20
=
6
:
10
(16)
4
x
:
16
=
−6
:
−2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
5
:
−5
=
20
:
x
+
4
5
×
(
x
+
4
)
=
−5
×
20
x
+
4
=
−20
x
=
−24
(2)
12
:
−3
x
=
1
:
−5
−3
x
=
12
×
(
−5
)
x
=
20
(3)
5
:
−3
=
60
:
−4
x
5
×
(
−4
)
x
=
−3
×
60
x
=
9
(4)
25
:
x
+
2
=
−5
:
−2
−5
×
(
x
+
2
)
=
25
×
(
−2
)
x
+
2
=
10
x
=
8
(5)
−9
:
3
=
−
x
:
−4
3
×
(
−1
)
x
=
−9
×
(
−4
)
x
=
−12
(6)
−5
x
:
60
=
−2
:
6
6
×
(
−5
)
x
=
60
×
(
−2
)
x
=
4
(7)
50
:
5
x
=
−8
:
−4
−8
×
5
x
=
50
×
(
−4
)
x
=
5
(8)
5
:
1
=
−60
:
4
x
5
×
4
x
=
−60
x
=
−3
(9)
9
:
−3
=
−9
:
x
+
3
9
×
(
x
+
3
)
=
−3
×
(
−9
)
x
+
3
=
3
x
=
0
(10)
−12
:
−4
=
x
+
2
:
−5
−4
×
(
x
+
2
)
=
−12
×
(
−5
)
x
+
2
=
−15
x
=
−17
(11)
2
:
8
=
−5
:
x
+
5
2
×
(
x
+
5
)
=
8
×
(
−5
)
x
+
5
=
−20
x
=
−25
(12)
25
:
20
=
−3
x
:
−12
20
×
(
−3
)
x
=
25
×
(
−12
)
x
=
5
(13)
25
:
x
+
4
=
−20
:
4
−20
×
(
x
+
4
)
=
25
×
4
x
+
4
=
−5
x
=
−9
(14)
−
x
:
−1
=
5
:
−5
−5
×
(
−1
)
x
=
−
5
x
=
−1
(15)
4
x
:
−20
=
6
:
10
10
×
4
x
=
−20
×
6
x
=
−3
(16)
4
x
:
16
=
−6
:
−2
−2
×
4
x
=
16
×
(
−6
)
x
=
12