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©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の比例式を解きなさい
[0G0-00]
(1)
−5
:
x
=
1
:
−5
(2)
−5
:
x
=
4
:
16
(3)
5
:
1
=
x
:
5
(4)
6
:
x
=
2
:
−3
(5)
4
:
x
=
−16
:
16
(6)
x
:
12
=
−3
:
3
(7)
−1
:
−2
=
2
:
x
(8)
−1
:
x
=
2
:
6
(9)
x
:
3
=
−8
:
−12
(10)
20
:
4
=
x
:
−1
(11)
x
:
−2
=
−4
:
−8
(12)
4
:
8
=
−1
:
x
(13)
−4
:
4
=
x
:
1
(14)
9
:
x
=
3
:
2
(15)
16
:
−4
=
x
:
5
(16)
x
:
15
=
1
:
5
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−5
:
x
=
1
:
−5
x
=
−5
×
(
−5
)
x
=
25
(2)
−5
:
x
=
4
:
16
4
x
=
−5
×
16
x
=
−20
(3)
5
:
1
=
x
:
5
x
=
5
×
5
x
=
25
(4)
6
:
x
=
2
:
−3
2
x
=
6
×
(
−3
)
x
=
−9
(5)
4
:
x
=
−16
:
16
−16
x
=
4
×
16
x
=
−4
(6)
x
:
12
=
−3
:
3
3
x
=
12
×
(
−3
)
x
=
−12
(7)
−1
:
−2
=
2
:
x
−
x
=
−2
×
2
x
=
4
(8)
−1
:
x
=
2
:
6
2
x
=
−
6
x
=
−3
(9)
x
:
3
=
−8
:
−12
−12
x
=
3
×
(
−8
)
x
=
2
(10)
20
:
4
=
x
:
−1
4
x
=
20
×
(
−1
)
x
=
−5
(11)
x
:
−2
=
−4
:
−8
−8
x
=
−2
×
(
−4
)
x
=
−1
(12)
4
:
8
=
−1
:
x
4
x
=
8
×
(
−1
)
x
=
−2
(13)
−4
:
4
=
x
:
1
4
x
=
−4
x
=
−1
(14)
9
:
x
=
3
:
2
3
x
=
9
×
2
x
=
6
(15)
16
:
−4
=
x
:
5
−4
x
=
16
×
5
x
=
−20
(16)
x
:
15
=
1
:
5
5
x
=
15
x
=
3