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