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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)
−1
:
4
=
5
x
:
60
(2)
2
:
1
=
−
x
:
2
(3)
x
−
1
:
−4
=
8
:
4
(4)
−20
:
5
x
=
4
:
−1
(5)
3
x
:
−9
=
−4
:
−12
(6)
9
:
3
=
x
−
3
:
−1
(7)
−
x
:
9
=
−4
:
3
(8)
2
x
:
−4
=
4
:
8
(9)
−1
:
−3
=
1
:
x
+
2
(10)
−12
:
−9
=
−12
:
3
x
(11)
−10
:
5
=
−4
x
:
8
(12)
x
−
5
:
−10
=
−5
:
−25
(13)
12
:
4
=
15
:
x
+
2
(14)
x
+
4
:
−6
=
−1
:
−2
(15)
5
:
−1
=
15
:
x
+
3
(16)
2
:
−8
=
−2
:
x
−
2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−1
:
4
=
5
x
:
60
4
×
5
x
=
−
60
x
=
−3
(2)
2
:
1
=
−
x
:
2
−1
x
=
2
×
2
x
=
−4
(3)
x
−
1
:
−4
=
8
:
4
4
×
(
x
−
1
)
=
−4
×
8
x
−
1
=
−8
x
=
−7
(4)
−20
:
5
x
=
4
:
−1
4
×
5
x
=
−20
×
(
−1
)
x
=
1
(5)
3
x
:
−9
=
−4
:
−12
−12
×
3
x
=
−9
×
(
−4
)
x
=
−1
(6)
9
:
3
=
x
−
3
:
−1
3
×
(
x
−
3
)
=
9
×
(
−1
)
x
−
3
=
−3
x
=
0
(7)
−
x
:
9
=
−4
:
3
3
×
(
−1
)
x
=
9
×
(
−4
)
x
=
12
(8)
2
x
:
−4
=
4
:
8
8
×
2
x
=
−4
×
4
x
=
−1
(9)
−1
:
−3
=
1
:
x
+
2
−
(
x
+
2
)
=
−3
x
+
2
=
3
x
=
1
(10)
−12
:
−9
=
−12
:
3
x
−12
×
3
x
=
−9
×
(
−12
)
x
=
−3
(11)
−10
:
5
=
−4
x
:
8
5
×
(
−4
)
x
=
−10
×
8
x
=
4
(12)
x
−
5
:
−10
=
−5
:
−25
−25
×
(
x
−
5
)
=
−10
×
(
−5
)
x
−
5
=
−2
x
=
3
(13)
12
:
4
=
15
:
x
+
2
12
×
(
x
+
2
)
=
4
×
15
x
+
2
=
5
x
=
3
(14)
x
+
4
:
−6
=
−1
:
−2
−2
×
(
x
+
4
)
=
−6
×
(
−1
)
x
+
4
=
−3
x
=
−7
(15)
5
:
−1
=
15
:
x
+
3
5
×
(
x
+
3
)
=
−
15
x
+
3
=
−3
x
=
−6
(16)
2
:
−8
=
−2
:
x
−
2
2
×
(
x
−
2
)
=
−8
×
(
−2
)
x
−
2
=
8
x
=
10