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