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