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