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