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