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