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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)
3
:
x
−
4
=
−6
:
2
(2)
5
:
−15
=
x
−
2
:
−9
(3)
−4
:
x
+
2
=
1
:
3
(4)
5
:
20
=
2
x
:
32
(5)
−2
x
:
50
=
2
:
−5
(6)
−2
:
−5
=
x
−
1
:
15
(7)
5
:
−5
=
x
+
2
:
−4
(8)
−2
x
:
−6
=
−25
:
5
(9)
−12
:
6
=
4
:
x
−
1
(10)
3
:
1
=
x
+
5
:
−4
(11)
15
:
−25
=
3
:
x
−
5
(12)
−2
:
x
+
2
=
−3
:
3
(13)
4
x
:
−16
=
12
:
4
(14)
−10
:
8
=
x
−
2
:
−4
(15)
x
+
5
:
1
=
−8
:
2
(16)
15
:
x
+
4
=
−12
:
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
3
:
x
−
4
=
−6
:
2
−6
×
(
x
−
4
)
=
3
×
2
x
−
4
=
−1
x
=
3
(2)
5
:
−15
=
x
−
2
:
−9
−15
×
(
x
−
2
)
=
5
×
(
−9
)
x
−
2
=
3
x
=
5
(3)
−4
:
x
+
2
=
1
:
3
x
+
2
=
−4
×
3
x
+
2
=
−12
x
=
−14
(4)
5
:
20
=
2
x
:
32
20
×
2
x
=
5
×
32
x
=
4
(5)
−2
x
:
50
=
2
:
−5
−5
×
(
−2
)
x
=
50
×
2
x
=
10
(6)
−2
:
−5
=
x
−
1
:
15
−5
×
(
x
−
1
)
=
−2
×
15
x
−
1
=
6
x
=
7
(7)
5
:
−5
=
x
+
2
:
−4
−5
×
(
x
+
2
)
=
5
×
(
−4
)
x
+
2
=
4
x
=
2
(8)
−2
x
:
−6
=
−25
:
5
5
×
(
−2
)
x
=
−6
×
(
−25
)
x
=
−15
(9)
−12
:
6
=
4
:
x
−
1
−12
×
(
x
−
1
)
=
6
×
4
x
−
1
=
−2
x
=
−1
(10)
3
:
1
=
x
+
5
:
−4
x
+
5
=
3
×
(
−4
)
x
+
5
=
−12
x
=
−17
(11)
15
:
−25
=
3
:
x
−
5
15
×
(
x
−
5
)
=
−25
×
3
x
−
5
=
−5
x
=
0
(12)
−2
:
x
+
2
=
−3
:
3
−3
×
(
x
+
2
)
=
−2
×
3
x
+
2
=
2
x
=
0
(13)
4
x
:
−16
=
12
:
4
4
×
4
x
=
−16
×
12
x
=
−12
(14)
−10
:
8
=
x
−
2
:
−4
8
×
(
x
−
2
)
=
−10
×
(
−4
)
x
−
2
=
5
x
=
7
(15)
x
+
5
:
1
=
−8
:
2
2
×
(
x
+
5
)
=
−8
x
+
5
=
−4
x
=
−9
(16)
15
:
x
+
4
=
−12
:
4
−12
×
(
x
+
4
)
=
15
×
4
x
+
4
=
−5
x
=
−9