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