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