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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
[0G0-00]
(1)
4
:
x
=
6
:
−3
(2)
x
:
2
=
20
:
−5
(3)
2
:
−8
=
1
:
x
(4)
−2
:
x
=
10
:
5
(5)
x
:
−12
=
−1
:
4
(6)
10
:
−20
=
x
:
4
(7)
−4
:
−16
=
x
:
−4
(8)
−2
:
x
=
4
:
−8
(9)
8
:
4
=
−6
:
x
(10)
−2
:
−4
=
x
:
20
(11)
x
:
−15
=
1
:
−5
(12)
−3
:
−1
=
x
:
−2
(13)
1
:
x
=
−1
:
−4
(14)
−25
:
x
=
5
:
−3
(15)
9
:
−15
=
−3
:
x
(16)
−2
:
1
=
−4
:
x
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
4
:
x
=
6
:
−3
6
x
=
4
×
(
−3
)
x
=
−2
(2)
x
:
2
=
20
:
−5
−5
x
=
2
×
20
x
=
−8
(3)
2
:
−8
=
1
:
x
2
x
=
−8
x
=
−4
(4)
−2
:
x
=
10
:
5
10
x
=
−2
×
5
x
=
−1
(5)
x
:
−12
=
−1
:
4
4
x
=
−12
×
(
−1
)
x
=
3
(6)
10
:
−20
=
x
:
4
−20
x
=
10
×
4
x
=
−2
(7)
−4
:
−16
=
x
:
−4
−16
x
=
−4
×
(
−4
)
x
=
−1
(8)
−2
:
x
=
4
:
−8
4
x
=
−2
×
(
−8
)
x
=
4
(9)
8
:
4
=
−6
:
x
8
x
=
4
×
(
−6
)
x
=
−3
(10)
−2
:
−4
=
x
:
20
−4
x
=
−2
×
20
x
=
10
(11)
x
:
−15
=
1
:
−5
−5
x
=
−15
x
=
3
(12)
−3
:
−1
=
x
:
−2
−
x
=
−3
×
(
−2
)
x
=
−6
(13)
1
:
x
=
−1
:
−4
−
x
=
−4
x
=
4
(14)
−25
:
x
=
5
:
−3
5
x
=
−25
×
(
−3
)
x
=
15
(15)
9
:
−15
=
−3
:
x
9
x
=
−15
×
(
−3
)
x
=
5
(16)
−2
:
1
=
−4
:
x
−2
x
=
−4
x
=
2