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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)
−1
:
−2
=
5
:
x
(2)
4
:
x
=
1
:
5
(3)
x
:
−1
=
10
:
2
(4)
−3
:
x
=
9
:
3
(5)
2
:
3
=
−2
:
x
(6)
−8
:
2
=
x
:
5
(7)
x
:
−3
=
6
:
3
(8)
−6
:
x
=
10
:
5
(9)
2
:
−4
=
3
:
x
(10)
−8
:
−12
=
2
:
x
(11)
−4
:
x
=
−20
:
15
(12)
20
:
x
=
4
:
5
(13)
x
:
−20
=
−4
:
5
(14)
3
:
−4
=
x
:
−12
(15)
−3
:
−4
=
−6
:
x
(16)
3
:
−3
=
x
:
12
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−1
:
−2
=
5
:
x
−
x
=
−2
×
5
x
=
10
(2)
4
:
x
=
1
:
5
x
=
4
×
5
x
=
20
(3)
x
:
−1
=
10
:
2
2
x
=
−
10
x
=
−5
(4)
−3
:
x
=
9
:
3
9
x
=
−3
×
3
x
=
−1
(5)
2
:
3
=
−2
:
x
2
x
=
3
×
(
−2
)
x
=
−3
(6)
−8
:
2
=
x
:
5
2
x
=
−8
×
5
x
=
−20
(7)
x
:
−3
=
6
:
3
3
x
=
−3
×
6
x
=
−6
(8)
−6
:
x
=
10
:
5
10
x
=
−6
×
5
x
=
−3
(9)
2
:
−4
=
3
:
x
2
x
=
−4
×
3
x
=
−6
(10)
−8
:
−12
=
2
:
x
−8
x
=
−12
×
2
x
=
3
(11)
−4
:
x
=
−20
:
15
−20
x
=
−4
×
15
x
=
3
(12)
20
:
x
=
4
:
5
4
x
=
20
×
5
x
=
25
(13)
x
:
−20
=
−4
:
5
5
x
=
−20
×
(
−4
)
x
=
16
(14)
3
:
−4
=
x
:
−12
−4
x
=
3
×
(
−12
)
x
=
9
(15)
−3
:
−4
=
−6
:
x
−3
x
=
−4
×
(
−6
)
x
=
−8
(16)
3
:
−3
=
x
:
12
−3
x
=
3
×
12
x
=
−12