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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)
−2
:
−4
=
−3
x
:
−6
(2)
10
:
6
=
3
x
:
−9
(3)
3
x
:
−45
=
5
:
25
(4)
−5
:
−25
=
4
:
x
−
4
(5)
12
:
3
x
=
−12
:
−9
(6)
−5
x
:
50
=
−4
:
−8
(7)
30
:
−2
x
=
−3
:
5
(8)
5
:
−5
x
=
1
:
2
(9)
10
:
5
=
x
+
4
:
−3
(10)
2
x
:
32
=
3
:
12
(11)
−5
x
:
45
=
−4
:
12
(12)
3
:
12
=
x
+
5
:
8
(13)
−10
:
−8
=
−3
x
:
−12
(14)
12
:
−4
=
x
−
5
:
5
(15)
−40
:
−2
x
=
4
:
5
(16)
9
:
3
x
=
1
:
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−2
:
−4
=
−3
x
:
−6
−4
×
(
−3
)
x
=
−2
×
(
−6
)
x
=
1
(2)
10
:
6
=
3
x
:
−9
6
×
3
x
=
10
×
(
−9
)
x
=
−5
(3)
3
x
:
−45
=
5
:
25
25
×
3
x
=
−45
×
5
x
=
−3
(4)
−5
:
−25
=
4
:
x
−
4
−5
×
(
x
−
4
)
=
−25
×
4
x
−
4
=
20
x
=
24
(5)
12
:
3
x
=
−12
:
−9
−12
×
3
x
=
12
×
(
−9
)
x
=
3
(6)
−5
x
:
50
=
−4
:
−8
−8
×
(
−5
)
x
=
50
×
(
−4
)
x
=
−5
(7)
30
:
−2
x
=
−3
:
5
−3
×
(
−2
)
x
=
30
×
5
x
=
25
(8)
5
:
−5
x
=
1
:
2
−5
x
=
5
×
2
x
=
−2
(9)
10
:
5
=
x
+
4
:
−3
5
×
(
x
+
4
)
=
10
×
(
−3
)
x
+
4
=
−6
x
=
−10
(10)
2
x
:
32
=
3
:
12
12
×
2
x
=
32
×
3
x
=
4
(11)
−5
x
:
45
=
−4
:
12
12
×
(
−5
)
x
=
45
×
(
−4
)
x
=
3
(12)
3
:
12
=
x
+
5
:
8
12
×
(
x
+
5
)
=
3
×
8
x
+
5
=
2
x
=
−3
(13)
−10
:
−8
=
−3
x
:
−12
−8
×
(
−3
)
x
=
−10
×
(
−12
)
x
=
5
(14)
12
:
−4
=
x
−
5
:
5
−4
×
(
x
−
5
)
=
12
×
5
x
−
5
=
−15
x
=
−10
(15)
−40
:
−2
x
=
4
:
5
4
×
(
−2
)
x
=
−40
×
5
x
=
25
(16)
9
:
3
x
=
1
:
4
3
x
=
9
×
4
x
=
12