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