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