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