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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)
−20
:
4
=
−15
:
−3
x
(2)
−60
:
−5
x
=
−3
:
−1
(3)
5
:
1
=
−
x
:
2
(4)
2
:
−10
=
−5
:
−5
x
(5)
20
:
16
=
−5
x
:
−20
(6)
−25
:
5
x
=
−15
:
3
(7)
2
x
:
6
=
−1
:
1
(8)
−12
:
−4
x
=
−6
:
−10
(9)
x
−
2
:
2
=
2
:
−4
(10)
x
+
5
:
−20
=
−5
:
5
(11)
−3
:
−15
=
16
:
−4
x
(12)
4
:
1
=
−80
:
−4
x
(13)
3
:
−3
x
=
1
:
−3
(14)
−5
:
4
=
20
:
x
−
2
(15)
8
:
−4
=
2
:
x
+
2
(16)
−2
:
4
=
x
−
3
:
−4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−20
:
4
=
−15
:
−3
x
−20
×
(
−3
)
x
=
4
×
(
−15
)
x
=
−1
(2)
−60
:
−5
x
=
−3
:
−1
−3
×
(
−5
)
x
=
−60
×
(
−1
)
x
=
4
(3)
5
:
1
=
−
x
:
2
−1
x
=
5
×
2
x
=
−10
(4)
2
:
−10
=
−5
:
−5
x
2
×
(
−5
)
x
=
−10
×
(
−5
)
x
=
−5
(5)
20
:
16
=
−5
x
:
−20
16
×
(
−5
)
x
=
20
×
(
−20
)
x
=
5
(6)
−25
:
5
x
=
−15
:
3
−15
×
5
x
=
−25
×
3
x
=
1
(7)
2
x
:
6
=
−1
:
1
2
x
=
6
×
(
−1
)
x
=
−3
(8)
−12
:
−4
x
=
−6
:
−10
−6
×
(
−4
)
x
=
−12
×
(
−10
)
x
=
5
(9)
x
−
2
:
2
=
2
:
−4
−4
×
(
x
−
2
)
=
2
×
2
x
−
2
=
−1
x
=
1
(10)
x
+
5
:
−20
=
−5
:
5
5
×
(
x
+
5
)
=
−20
×
(
−5
)
x
+
5
=
20
x
=
15
(11)
−3
:
−15
=
16
:
−4
x
−3
×
(
−4
)
x
=
−15
×
16
x
=
−20
(12)
4
:
1
=
−80
:
−4
x
4
×
(
−4
)
x
=
−80
x
=
5
(13)
3
:
−3
x
=
1
:
−3
−3
x
=
3
×
(
−3
)
x
=
3
(14)
−5
:
4
=
20
:
x
−
2
−5
×
(
x
−
2
)
=
4
×
20
x
−
2
=
−16
x
=
−14
(15)
8
:
−4
=
2
:
x
+
2
8
×
(
x
+
2
)
=
−4
×
2
x
+
2
=
−1
x
=
−3
(16)
−2
:
4
=
x
−
3
:
−4
4
×
(
x
−
3
)
=
−2
×
(
−4
)
x
−
3
=
2
x
=
5