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