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