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