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