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