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