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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)
−100
:
4
x
=
5
:
−4
(2)
2
:
−5
=
4
x
:
60
(3)
−1
:
−4
=
−4
x
:
48
(4)
x
−
2
:
4
=
3
:
−12
(5)
−4
x
:
−4
=
4
:
−4
(6)
−9
:
x
+
3
=
−3
:
5
(7)
1
:
3
=
x
−
2
:
−3
(8)
x
+
2
:
−1
=
−8
:
4
(9)
−1
:
2
=
3
:
x
−
5
(10)
4
:
16
=
−
x
:
−20
(11)
1
:
−1
=
−15
:
−5
x
(12)
4
:
−4
=
−3
x
:
−9
(13)
x
+
4
:
9
=
5
:
3
(14)
20
:
x
+
3
=
−15
:
−3
(15)
−4
x
:
20
=
5
:
−1
(16)
3
:
−4
=
−15
:
5
x
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−100
:
4
x
=
5
:
−4
5
×
4
x
=
−100
×
(
−4
)
x
=
20
(2)
2
:
−5
=
4
x
:
60
−5
×
4
x
=
2
×
60
x
=
−6
(3)
−1
:
−4
=
−4
x
:
48
−4
×
(
−4
)
x
=
−
48
x
=
−3
(4)
x
−
2
:
4
=
3
:
−12
−12
×
(
x
−
2
)
=
4
×
3
x
−
2
=
−1
x
=
1
(5)
−4
x
:
−4
=
4
:
−4
−4
×
(
−4
)
x
=
−4
×
4
x
=
−1
(6)
−9
:
x
+
3
=
−3
:
5
−3
×
(
x
+
3
)
=
−9
×
5
x
+
3
=
15
x
=
12
(7)
1
:
3
=
x
−
2
:
−3
3
×
(
x
−
2
)
=
−3
x
−
2
=
−1
x
=
1
(8)
x
+
2
:
−1
=
−8
:
4
4
×
(
x
+
2
)
=
−
(
−8
)
x
+
2
=
2
x
=
0
(9)
−1
:
2
=
3
:
x
−
5
−
(
x
−
5
)
=
2
×
3
x
−
5
=
−6
x
=
−1
(10)
4
:
16
=
−
x
:
−20
16
×
(
−1
)
x
=
4
×
(
−20
)
x
=
5
(11)
1
:
−1
=
−15
:
−5
x
−5
x
=
−
(
−15
)
x
=
−3
(12)
4
:
−4
=
−3
x
:
−9
−4
×
(
−3
)
x
=
4
×
(
−9
)
x
=
−3
(13)
x
+
4
:
9
=
5
:
3
3
×
(
x
+
4
)
=
9
×
5
x
+
4
=
15
x
=
11
(14)
20
:
x
+
3
=
−15
:
−3
−15
×
(
x
+
3
)
=
20
×
(
−3
)
x
+
3
=
4
x
=
1
(15)
−4
x
:
20
=
5
:
−1
−
(
−4
)
x
=
20
×
5
x
=
25
(16)
3
:
−4
=
−15
:
5
x
3
×
5
x
=
−4
×
(
−15
)
x
=
4