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©2024 数学クラブ http://sugaku.club/
月 日( )
● 次の比例式を解きなさい
[0G0-00]
(1)
−4
:
5
=
x
:
−5
(2)
−12
:
x
=
20
:
5
(3)
3
:
x
=
1
:
−1
(4)
15
:
x
=
−10
:
2
(5)
4
:
x
=
12
:
−12
(6)
x
:
−1
=
−16
:
4
(7)
−4
:
−6
=
−2
:
x
(8)
12
:
x
=
6
:
−2
(9)
−12
:
4
=
x
:
3
(10)
−1
:
−2
=
1
:
x
(11)
x
:
−1
=
5
:
−5
(12)
−2
:
2
=
−1
:
x
(13)
1
:
x
=
−1
:
−5
(14)
x
:
−2
=
6
:
−6
(15)
1
:
5
=
−1
:
x
(16)
20
:
−4
=
−25
:
x
©2024 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−4
:
5
=
x
:
−5
5
x
=
−4
×
(
−5
)
x
=
4
(2)
−12
:
x
=
20
:
5
20
x
=
−12
×
5
x
=
−3
(3)
3
:
x
=
1
:
−1
x
=
3
×
(
−1
)
x
=
−3
(4)
15
:
x
=
−10
:
2
−10
x
=
15
×
2
x
=
−3
(5)
4
:
x
=
12
:
−12
12
x
=
4
×
(
−12
)
x
=
−4
(6)
x
:
−1
=
−16
:
4
4
x
=
−
(
−16
)
x
=
4
(7)
−4
:
−6
=
−2
:
x
−4
x
=
−6
×
(
−2
)
x
=
−3
(8)
12
:
x
=
6
:
−2
6
x
=
12
×
(
−2
)
x
=
−4
(9)
−12
:
4
=
x
:
3
4
x
=
−12
×
3
x
=
−9
(10)
−1
:
−2
=
1
:
x
−
x
=
−2
x
=
2
(11)
x
:
−1
=
5
:
−5
−5
x
=
−
5
x
=
1
(12)
−2
:
2
=
−1
:
x
−2
x
=
2
×
(
−1
)
x
=
1
(13)
1
:
x
=
−1
:
−5
−
x
=
−5
x
=
5
(14)
x
:
−2
=
6
:
−6
−6
x
=
−2
×
6
x
=
2
(15)
1
:
5
=
−1
:
x
x
=
5
×
(
−1
)
x
=
−5
(16)
20
:
−4
=
−25
:
x
20
x
=
−4
×
(
−25
)
x
=
5