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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)
−6
:
−3
=
−30
:
−5
x
(2)
−3
:
9
=
−5
x
:
75
(3)
5
:
x
+
2
=
−25
:
25
(4)
−45
:
−5
x
=
6
:
2
(5)
−2
:
−1
=
−5
x
:
25
(6)
5
x
:
25
=
1
:
−5
(7)
−12
:
x
−
3
=
20
:
−5
(8)
−20
:
−5
x
=
16
:
−8
(9)
−45
:
−3
x
=
−15
:
5
(10)
−10
:
−15
=
2
:
−
x
(11)
4
:
x
−
5
=
5
:
15
(12)
−9
:
3
x
=
−9
:
−3
(13)
−5
:
5
=
−2
:
2
x
(14)
4
:
−1
=
12
:
x
−
4
(15)
−15
:
x
−
1
=
5
:
−1
(16)
4
x
:
48
=
1
:
−4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−6
:
−3
=
−30
:
−5
x
−6
×
(
−5
)
x
=
−3
×
(
−30
)
x
=
3
(2)
−3
:
9
=
−5
x
:
75
9
×
(
−5
)
x
=
−3
×
75
x
=
5
(3)
5
:
x
+
2
=
−25
:
25
−25
×
(
x
+
2
)
=
5
×
25
x
+
2
=
−5
x
=
−7
(4)
−45
:
−5
x
=
6
:
2
6
×
(
−5
)
x
=
−45
×
2
x
=
3
(5)
−2
:
−1
=
−5
x
:
25
−
(
−5
)
x
=
−2
×
25
x
=
−10
(6)
5
x
:
25
=
1
:
−5
−5
×
5
x
=
25
x
=
−1
(7)
−12
:
x
−
3
=
20
:
−5
20
×
(
x
−
3
)
=
−12
×
(
−5
)
x
−
3
=
3
x
=
6
(8)
−20
:
−5
x
=
16
:
−8
16
×
(
−5
)
x
=
−20
×
(
−8
)
x
=
−2
(9)
−45
:
−3
x
=
−15
:
5
−15
×
(
−3
)
x
=
−45
×
5
x
=
−5
(10)
−10
:
−15
=
2
:
−
x
−10
×
(
−1
)
x
=
−15
×
2
x
=
−3
(11)
4
:
x
−
5
=
5
:
15
5
×
(
x
−
5
)
=
4
×
15
x
−
5
=
12
x
=
17
(12)
−9
:
3
x
=
−9
:
−3
−9
×
3
x
=
−9
×
(
−3
)
x
=
−1
(13)
−5
:
5
=
−2
:
2
x
−5
×
2
x
=
5
×
(
−2
)
x
=
1
(14)
4
:
−1
=
12
:
x
−
4
4
×
(
x
−
4
)
=
−
12
x
−
4
=
−3
x
=
1
(15)
−15
:
x
−
1
=
5
:
−1
5
×
(
x
−
1
)
=
−15
×
(
−1
)
x
−
1
=
3
x
=
4
(16)
4
x
:
48
=
1
:
−4
−4
×
4
x
=
48
x
=
−3