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©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の比例式を解きなさい
[0G0-00]
(1)
1
:
4
=
−1
:
x
(2)
x
:
8
=
−3
:
12
(3)
x
:
−3
=
−4
:
−12
(4)
−2
:
x
=
6
:
−9
(5)
−2
:
−10
=
x
:
−20
(6)
x
:
−2
=
−9
:
−3
(7)
9
:
x
=
−15
:
−5
(8)
5
:
−2
=
x
:
10
(9)
1
:
−1
=
x
:
−2
(10)
5
:
x
=
−15
:
6
(11)
x
:
3
=
10
:
15
(12)
−3
:
15
=
1
:
x
(13)
−5
:
10
=
x
:
−2
(14)
2
:
4
=
x
:
2
(15)
2
:
−1
=
−4
:
x
(16)
−9
:
x
=
−3
:
3
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
1
:
4
=
−1
:
x
x
=
4
×
(
−1
)
x
=
−4
(2)
x
:
8
=
−3
:
12
12
x
=
8
×
(
−3
)
x
=
−2
(3)
x
:
−3
=
−4
:
−12
−12
x
=
−3
×
(
−4
)
x
=
−1
(4)
−2
:
x
=
6
:
−9
6
x
=
−2
×
(
−9
)
x
=
3
(5)
−2
:
−10
=
x
:
−20
−10
x
=
−2
×
(
−20
)
x
=
−4
(6)
x
:
−2
=
−9
:
−3
−3
x
=
−2
×
(
−9
)
x
=
−6
(7)
9
:
x
=
−15
:
−5
−15
x
=
9
×
(
−5
)
x
=
3
(8)
5
:
−2
=
x
:
10
−2
x
=
5
×
10
x
=
−25
(9)
1
:
−1
=
x
:
−2
−
x
=
−2
x
=
2
(10)
5
:
x
=
−15
:
6
−15
x
=
5
×
6
x
=
−2
(11)
x
:
3
=
10
:
15
15
x
=
3
×
10
x
=
2
(12)
−3
:
15
=
1
:
x
−3
x
=
15
x
=
−5
(13)
−5
:
10
=
x
:
−2
10
x
=
−5
×
(
−2
)
x
=
1
(14)
2
:
4
=
x
:
2
4
x
=
2
×
2
x
=
1
(15)
2
:
−1
=
−4
:
x
2
x
=
−
(
−4
)
x
=
2
(16)
−9
:
x
=
−3
:
3
−3
x
=
−9
×
3
x
=
9