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©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の比例式を解きなさい
[0G1-00]
(1)
15
:
−5
x
=
15
:
−20
(2)
−3
:
4
=
3
x
:
−12
(3)
4
:
−10
=
−10
:
5
x
(4)
−4
:
−2
=
−32
:
2
x
(5)
x
−
5
:
6
=
2
:
−3
(6)
15
:
x
−
1
=
3
:
−5
(7)
−3
:
−12
=
−2
:
2
x
(8)
−5
:
x
−
2
=
20
:
−16
(9)
−4
x
:
−16
=
1
:
2
(10)
3
x
:
−3
=
3
:
1
(11)
2
:
1
=
4
:
x
+
4
(12)
20
:
x
−
5
=
15
:
−3
(13)
3
x
:
3
=
4
:
−2
(14)
50
:
−5
x
=
−5
:
3
(15)
−10
:
−5
x
=
−8
:
−4
(16)
3
x
:
9
=
−12
:
9
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
15
:
−5
x
=
15
:
−20
15
×
(
−5
)
x
=
15
×
(
−20
)
x
=
4
(2)
−3
:
4
=
3
x
:
−12
4
×
3
x
=
−3
×
(
−12
)
x
=
3
(3)
4
:
−10
=
−10
:
5
x
4
×
5
x
=
−10
×
(
−10
)
x
=
5
(4)
−4
:
−2
=
−32
:
2
x
−4
×
2
x
=
−2
×
(
−32
)
x
=
−8
(5)
x
−
5
:
6
=
2
:
−3
−3
×
(
x
−
5
)
=
6
×
2
x
−
5
=
−4
x
=
1
(6)
15
:
x
−
1
=
3
:
−5
3
×
(
x
−
1
)
=
15
×
(
−5
)
x
−
1
=
−25
x
=
−24
(7)
−3
:
−12
=
−2
:
2
x
−3
×
2
x
=
−12
×
(
−2
)
x
=
−4
(8)
−5
:
x
−
2
=
20
:
−16
20
×
(
x
−
2
)
=
−5
×
(
−16
)
x
−
2
=
4
x
=
6
(9)
−4
x
:
−16
=
1
:
2
2
×
(
−4
)
x
=
−16
x
=
2
(10)
3
x
:
−3
=
3
:
1
3
x
=
−3
×
3
x
=
−3
(11)
2
:
1
=
4
:
x
+
4
2
×
(
x
+
4
)
=
4
x
+
4
=
2
x
=
−2
(12)
20
:
x
−
5
=
15
:
−3
15
×
(
x
−
5
)
=
20
×
(
−3
)
x
−
5
=
−4
x
=
1
(13)
3
x
:
3
=
4
:
−2
−2
×
3
x
=
3
×
4
x
=
−2
(14)
50
:
−5
x
=
−5
:
3
−5
×
(
−5
)
x
=
50
×
3
x
=
6
(15)
−10
:
−5
x
=
−8
:
−4
−8
×
(
−5
)
x
=
−10
×
(
−4
)
x
=
1
(16)
3
x
:
9
=
−12
:
9
9
×
3
x
=
9
×
(
−12
)
x
=
−4