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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)
−12
:
3
=
x
+
3
:
−5
(2)
2
:
4
=
x
+
3
:
−2
(3)
−8
:
4
=
−2
x
:
4
(4)
x
−
4
:
−4
=
1
:
−1
(5)
−4
:
−3
=
x
−
5
:
−15
(6)
−10
:
5
x
=
−4
:
12
(7)
−
x
:
5
=
2
:
10
(8)
−2
x
:
−40
=
−2
:
10
(9)
−16
:
4
=
x
+
4
:
−1
(10)
−1
:
−5
=
4
x
:
40
(11)
x
+
5
:
4
=
−2
:
−4
(12)
4
:
1
=
x
+
4
:
3
(13)
x
+
5
:
−1
=
4
:
2
(14)
3
:
5
=
−45
:
5
x
(15)
2
:
x
+
4
=
5
:
−25
(16)
−2
:
−5
=
x
+
3
:
25
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−12
:
3
=
x
+
3
:
−5
3
×
(
x
+
3
)
=
−12
×
(
−5
)
x
+
3
=
20
x
=
17
(2)
2
:
4
=
x
+
3
:
−2
4
×
(
x
+
3
)
=
2
×
(
−2
)
x
+
3
=
−1
x
=
−4
(3)
−8
:
4
=
−2
x
:
4
4
×
(
−2
)
x
=
−8
×
4
x
=
4
(4)
x
−
4
:
−4
=
1
:
−1
−
(
x
−
4
)
=
−4
x
−
4
=
4
x
=
8
(5)
−4
:
−3
=
x
−
5
:
−15
−3
×
(
x
−
5
)
=
−4
×
(
−15
)
x
−
5
=
−20
x
=
−15
(6)
−10
:
5
x
=
−4
:
12
−4
×
5
x
=
−10
×
12
x
=
6
(7)
−
x
:
5
=
2
:
10
10
×
(
−1
)
x
=
5
×
2
x
=
−1
(8)
−2
x
:
−40
=
−2
:
10
10
×
(
−2
)
x
=
−40
×
(
−2
)
x
=
−4
(9)
−16
:
4
=
x
+
4
:
−1
4
×
(
x
+
4
)
=
−16
×
(
−1
)
x
+
4
=
4
x
=
0
(10)
−1
:
−5
=
4
x
:
40
−5
×
4
x
=
−
40
x
=
2
(11)
x
+
5
:
4
=
−2
:
−4
−4
×
(
x
+
5
)
=
4
×
(
−2
)
x
+
5
=
2
x
=
−3
(12)
4
:
1
=
x
+
4
:
3
x
+
4
=
4
×
3
x
+
4
=
12
x
=
8
(13)
x
+
5
:
−1
=
4
:
2
2
×
(
x
+
5
)
=
−
4
x
+
5
=
−2
x
=
−7
(14)
3
:
5
=
−45
:
5
x
3
×
5
x
=
5
×
(
−45
)
x
=
−15
(15)
2
:
x
+
4
=
5
:
−25
5
×
(
x
+
4
)
=
2
×
(
−25
)
x
+
4
=
−10
x
=
−14
(16)
−2
:
−5
=
x
+
3
:
25
−5
×
(
x
+
3
)
=
−2
×
25
x
+
3
=
10
x
=
7