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