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