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