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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
:
−5
=
x
+
4
:
20
(2)
3
:
15
=
5
:
x
−
3
(3)
x
−
5
:
−5
=
−16
:
−20
(4)
−10
:
5
=
24
:
−4
x
(5)
−12
:
x
+
2
=
8
:
2
(6)
−2
:
1
=
−50
:
−5
x
(7)
−4
:
−12
=
6
:
−2
x
(8)
20
:
−5
x
=
−1
:
−3
(9)
−3
x
:
−36
=
1
:
−4
(10)
5
:
x
+
3
=
−20
:
−12
(11)
3
:
x
−
2
=
−12
:
8
(12)
−3
:
9
=
x
−
2
:
6
(13)
−5
:
1
=
−60
:
4
x
(14)
−6
:
−12
=
−2
x
:
8
(15)
−4
:
−2
=
−40
:
5
x
(16)
−5
:
x
+
4
=
−1
:
1
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
4
:
−5
=
x
+
4
:
20
−5
×
(
x
+
4
)
=
4
×
20
x
+
4
=
−16
x
=
−20
(2)
3
:
15
=
5
:
x
−
3
3
×
(
x
−
3
)
=
15
×
5
x
−
3
=
25
x
=
28
(3)
x
−
5
:
−5
=
−16
:
−20
−20
×
(
x
−
5
)
=
−5
×
(
−16
)
x
−
5
=
−4
x
=
1
(4)
−10
:
5
=
24
:
−4
x
−10
×
(
−4
)
x
=
5
×
24
x
=
3
(5)
−12
:
x
+
2
=
8
:
2
8
×
(
x
+
2
)
=
−12
×
2
x
+
2
=
−3
x
=
−5
(6)
−2
:
1
=
−50
:
−5
x
−2
×
(
−5
)
x
=
−50
x
=
−5
(7)
−4
:
−12
=
6
:
−2
x
−4
×
(
−2
)
x
=
−12
×
6
x
=
−9
(8)
20
:
−5
x
=
−1
:
−3
−
(
−5
)
x
=
20
×
(
−3
)
x
=
−12
(9)
−3
x
:
−36
=
1
:
−4
−4
×
(
−3
)
x
=
−36
x
=
−3
(10)
5
:
x
+
3
=
−20
:
−12
−20
×
(
x
+
3
)
=
5
×
(
−12
)
x
+
3
=
3
x
=
0
(11)
3
:
x
−
2
=
−12
:
8
−12
×
(
x
−
2
)
=
3
×
8
x
−
2
=
−2
x
=
0
(12)
−3
:
9
=
x
−
2
:
6
9
×
(
x
−
2
)
=
−3
×
6
x
−
2
=
−2
x
=
0
(13)
−5
:
1
=
−60
:
4
x
−5
×
4
x
=
−60
x
=
3
(14)
−6
:
−12
=
−2
x
:
8
−12
×
(
−2
)
x
=
−6
×
8
x
=
−2
(15)
−4
:
−2
=
−40
:
5
x
−4
×
5
x
=
−2
×
(
−40
)
x
=
−4
(16)
−5
:
x
+
4
=
−1
:
1
−
(
x
+
4
)
=
−5
x
+
4
=
5
x
=
1