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©2024 数学クラブ http://sugaku.club/
月 日( )
● 次の比例式を解きなさい
[0G0-00]
(1)
x
:
4
=
−1
:
2
(2)
4
:
x
=
2
:
1
(3)
2
:
x
=
−8
:
8
(4)
2
:
x
=
−4
:
4
(5)
6
:
2
=
−15
:
x
(6)
−4
:
−1
=
x
:
−2
(7)
3
:
15
=
x
:
−5
(8)
3
:
−1
=
12
:
x
(9)
−4
:
x
=
12
:
−3
(10)
x
:
3
=
−8
:
−6
(11)
8
:
x
=
−4
:
3
(12)
−3
:
x
=
15
:
5
(13)
1
:
3
=
x
:
−3
(14)
−9
:
x
=
3
:
−4
(15)
4
:
6
=
−2
:
x
(16)
5
:
15
=
1
:
x
©2024 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
:
4
=
−1
:
2
2
x
=
4
×
(
−1
)
x
=
−2
(2)
4
:
x
=
2
:
1
2
x
=
4
x
=
2
(3)
2
:
x
=
−8
:
8
−8
x
=
2
×
8
x
=
−2
(4)
2
:
x
=
−4
:
4
−4
x
=
2
×
4
x
=
−2
(5)
6
:
2
=
−15
:
x
6
x
=
2
×
(
−15
)
x
=
−5
(6)
−4
:
−1
=
x
:
−2
−
x
=
−4
×
(
−2
)
x
=
−8
(7)
3
:
15
=
x
:
−5
15
x
=
3
×
(
−5
)
x
=
−1
(8)
3
:
−1
=
12
:
x
3
x
=
−
12
x
=
−4
(9)
−4
:
x
=
12
:
−3
12
x
=
−4
×
(
−3
)
x
=
1
(10)
x
:
3
=
−8
:
−6
−6
x
=
3
×
(
−8
)
x
=
4
(11)
8
:
x
=
−4
:
3
−4
x
=
8
×
3
x
=
−6
(12)
−3
:
x
=
15
:
5
15
x
=
−3
×
5
x
=
−1
(13)
1
:
3
=
x
:
−3
3
x
=
−3
x
=
−1
(14)
−9
:
x
=
3
:
−4
3
x
=
−9
×
(
−4
)
x
=
12
(15)
4
:
6
=
−2
:
x
4
x
=
6
×
(
−2
)
x
=
−3
(16)
5
:
15
=
1
:
x
5
x
=
15
x
=
3