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