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