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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)
2
:
6
=
5
:
x
−
2
(2)
−1
:
−
x
=
3
:
−3
(3)
12
:
−4
=
x
−
4
:
3
(4)
5
:
−25
=
−5
x
:
75
(5)
x
−
4
:
2
=
2
:
4
(6)
−5
:
x
−
3
=
−1
:
1
(7)
4
:
−1
=
−32
:
−2
x
(8)
−4
:
−
x
=
1
:
−1
(9)
20
:
12
=
−10
:
−2
x
(10)
−9
:
3
x
=
1
:
2
(11)
−16
:
12
=
5
x
:
15
(12)
−3
x
:
−9
=
8
:
−4
(13)
x
+
3
:
−10
=
−3
:
5
(14)
12
:
4
x
=
−6
:
−8
(15)
4
:
−5
=
−100
:
−5
x
(16)
1
:
−1
=
−2
:
x
+
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
:
6
=
5
:
x
−
2
2
×
(
x
−
2
)
=
6
×
5
x
−
2
=
15
x
=
17
(2)
−1
:
−
x
=
3
:
−3
3
×
(
−1
)
x
=
−
(
−3
)
x
=
−1
(3)
12
:
−4
=
x
−
4
:
3
−4
×
(
x
−
4
)
=
12
×
3
x
−
4
=
−9
x
=
−5
(4)
5
:
−25
=
−5
x
:
75
−25
×
(
−5
)
x
=
5
×
75
x
=
3
(5)
x
−
4
:
2
=
2
:
4
4
×
(
x
−
4
)
=
2
×
2
x
−
4
=
1
x
=
5
(6)
−5
:
x
−
3
=
−1
:
1
−
(
x
−
3
)
=
−5
x
−
3
=
5
x
=
8
(7)
4
:
−1
=
−32
:
−2
x
4
×
(
−2
)
x
=
−
(
−32
)
x
=
−4
(8)
−4
:
−
x
=
1
:
−1
−1
x
=
−4
×
(
−1
)
x
=
−4
(9)
20
:
12
=
−10
:
−2
x
20
×
(
−2
)
x
=
12
×
(
−10
)
x
=
3
(10)
−9
:
3
x
=
1
:
2
3
x
=
−9
×
2
x
=
−6
(11)
−16
:
12
=
5
x
:
15
12
×
5
x
=
−16
×
15
x
=
−4
(12)
−3
x
:
−9
=
8
:
−4
−4
×
(
−3
)
x
=
−9
×
8
x
=
−6
(13)
x
+
3
:
−10
=
−3
:
5
5
×
(
x
+
3
)
=
−10
×
(
−3
)
x
+
3
=
6
x
=
3
(14)
12
:
4
x
=
−6
:
−8
−6
×
4
x
=
12
×
(
−8
)
x
=
4
(15)
4
:
−5
=
−100
:
−5
x
4
×
(
−5
)
x
=
−5
×
(
−100
)
x
=
−25
(16)
1
:
−1
=
−2
:
x
+
4
x
+
4
=
−
(
−2
)
x
+
4
=
2
x
=
−2