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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
[0G1-00]
(1)
−5
:
3
=
25
:
x
−
3
(2)
−12
:
4
x
=
12
:
−8
(3)
−5
x
:
20
=
−5
:
5
(4)
−6
:
−3
=
24
:
4
x
(5)
−16
:
x
−
4
=
4
:
3
(6)
−12
:
4
=
−9
:
−3
x
(7)
3
:
5
=
4
x
:
−20
(8)
2
:
1
=
−4
:
2
x
(9)
−4
:
x
−
5
=
4
:
−1
(10)
12
:
4
x
=
−3
:
3
(11)
x
−
2
:
8
=
−1
:
4
(12)
−
x
:
−20
=
−2
:
8
(13)
x
−
1
:
−5
=
15
:
−15
(14)
−5
:
3
=
−45
:
3
x
(15)
−64
:
4
x
=
−4
:
5
(16)
x
−
1
:
−25
=
1
:
5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−5
:
3
=
25
:
x
−
3
−5
×
(
x
−
3
)
=
3
×
25
x
−
3
=
−15
x
=
−12
(2)
−12
:
4
x
=
12
:
−8
12
×
4
x
=
−12
×
(
−8
)
x
=
2
(3)
−5
x
:
20
=
−5
:
5
5
×
(
−5
)
x
=
20
×
(
−5
)
x
=
4
(4)
−6
:
−3
=
24
:
4
x
−6
×
4
x
=
−3
×
24
x
=
3
(5)
−16
:
x
−
4
=
4
:
3
4
×
(
x
−
4
)
=
−16
×
3
x
−
4
=
−12
x
=
−8
(6)
−12
:
4
=
−9
:
−3
x
−12
×
(
−3
)
x
=
4
×
(
−9
)
x
=
−1
(7)
3
:
5
=
4
x
:
−20
5
×
4
x
=
3
×
(
−20
)
x
=
−3
(8)
2
:
1
=
−4
:
2
x
2
×
2
x
=
−4
x
=
−1
(9)
−4
:
x
−
5
=
4
:
−1
4
×
(
x
−
5
)
=
−4
×
(
−1
)
x
−
5
=
1
x
=
6
(10)
12
:
4
x
=
−3
:
3
−3
×
4
x
=
12
×
3
x
=
−3
(11)
x
−
2
:
8
=
−1
:
4
4
×
(
x
−
2
)
=
8
×
(
−1
)
x
−
2
=
−2
x
=
0
(12)
−
x
:
−20
=
−2
:
8
8
×
(
−1
)
x
=
−20
×
(
−2
)
x
=
−5
(13)
x
−
1
:
−5
=
15
:
−15
−15
×
(
x
−
1
)
=
−5
×
15
x
−
1
=
5
x
=
6
(14)
−5
:
3
=
−45
:
3
x
−5
×
3
x
=
3
×
(
−45
)
x
=
9
(15)
−64
:
4
x
=
−4
:
5
−4
×
4
x
=
−64
×
5
x
=
20
(16)
x
−
1
:
−25
=
1
:
5
5
×
(
x
−
1
)
=
−25
x
−
1
=
−5
x
=
−4