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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
[0G1-00]
(1)
10
:
2
=
2
x
:
−2
(2)
5
:
2
=
−
x
:
−6
(3)
−3
:
−1
=
−45
:
−3
x
(4)
−8
:
−4
=
2
x
:
−10
(5)
−4
:
−2
x
=
4
:
−4
(6)
4
:
x
−
3
=
2
:
1
(7)
−8
:
20
=
−2
:
x
+
4
(8)
−5
x
:
−5
=
4
:
2
(9)
−4
:
1
=
3
x
:
−12
(10)
1
:
−2
=
4
x
:
−16
(11)
−
x
:
−3
=
6
:
−2
(12)
−5
:
−20
=
8
:
2
x
(13)
5
:
20
=
−15
:
5
x
(14)
−1
:
−5
=
2
:
2
x
(15)
5
:
4
=
−20
:
−
x
(16)
x
−
2
:
−15
=
−1
:
5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
10
:
2
=
2
x
:
−2
2
×
2
x
=
10
×
(
−2
)
x
=
−5
(2)
5
:
2
=
−
x
:
−6
2
×
(
−1
)
x
=
5
×
(
−6
)
x
=
15
(3)
−3
:
−1
=
−45
:
−3
x
−3
×
(
−3
)
x
=
−
(
−45
)
x
=
5
(4)
−8
:
−4
=
2
x
:
−10
−4
×
2
x
=
−8
×
(
−10
)
x
=
−10
(5)
−4
:
−2
x
=
4
:
−4
4
×
(
−2
)
x
=
−4
×
(
−4
)
x
=
−2
(6)
4
:
x
−
3
=
2
:
1
2
×
(
x
−
3
)
=
4
x
−
3
=
2
x
=
5
(7)
−8
:
20
=
−2
:
x
+
4
−8
×
(
x
+
4
)
=
20
×
(
−2
)
x
+
4
=
5
x
=
1
(8)
−5
x
:
−5
=
4
:
2
2
×
(
−5
)
x
=
−5
×
4
x
=
2
(9)
−4
:
1
=
3
x
:
−12
3
x
=
−4
×
(
−12
)
x
=
16
(10)
1
:
−2
=
4
x
:
−16
−2
×
4
x
=
−16
x
=
2
(11)
−
x
:
−3
=
6
:
−2
−2
×
(
−1
)
x
=
−3
×
6
x
=
−9
(12)
−5
:
−20
=
8
:
2
x
−5
×
2
x
=
−20
×
8
x
=
16
(13)
5
:
20
=
−15
:
5
x
5
×
5
x
=
20
×
(
−15
)
x
=
−12
(14)
−1
:
−5
=
2
:
2
x
−
2
x
=
−5
×
2
x
=
5
(15)
5
:
4
=
−20
:
−
x
5
×
(
−1
)
x
=
4
×
(
−20
)
x
=
16
(16)
x
−
2
:
−15
=
−1
:
5
5
×
(
x
−
2
)
=
−15
×
(
−1
)
x
−
2
=
3
x
=
5