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