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