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