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