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