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