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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)
3
x
:
30
=
−4
:
5
(2)
10
:
−20
=
x
−
4
:
4
(3)
−4
:
1
=
x
−
3
:
−5
(4)
x
+
4
:
1
=
4
:
2
(5)
x
+
2
:
−2
=
−3
:
2
(6)
−5
x
:
−20
=
−5
:
−1
(7)
5
:
3
=
−2
x
:
−30
(8)
2
:
6
=
−2
x
:
6
(9)
−15
:
3
=
−4
x
:
20
(10)
−4
x
:
−4
=
15
:
5
(11)
6
:
−2
=
−2
x
:
−8
(12)
12
:
−4
x
=
9
:
−12
(13)
−
x
:
−3
=
−1
:
1
(14)
−2
:
2
=
3
x
:
−3
(15)
−12
:
3
x
=
1
:
−2
(16)
9
:
15
=
−
x
:
5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
3
x
:
30
=
−4
:
5
5
×
3
x
=
30
×
(
−4
)
x
=
−8
(2)
10
:
−20
=
x
−
4
:
4
−20
×
(
x
−
4
)
=
10
×
4
x
−
4
=
−2
x
=
2
(3)
−4
:
1
=
x
−
3
:
−5
x
−
3
=
−4
×
(
−5
)
x
−
3
=
20
x
=
23
(4)
x
+
4
:
1
=
4
:
2
2
×
(
x
+
4
)
=
4
x
+
4
=
2
x
=
−2
(5)
x
+
2
:
−2
=
−3
:
2
2
×
(
x
+
2
)
=
−2
×
(
−3
)
x
+
2
=
3
x
=
1
(6)
−5
x
:
−20
=
−5
:
−1
−
(
−5
)
x
=
−20
×
(
−5
)
x
=
20
(7)
5
:
3
=
−2
x
:
−30
3
×
(
−2
)
x
=
5
×
(
−30
)
x
=
25
(8)
2
:
6
=
−2
x
:
6
6
×
(
−2
)
x
=
2
×
6
x
=
−1
(9)
−15
:
3
=
−4
x
:
20
3
×
(
−4
)
x
=
−15
×
20
x
=
25
(10)
−4
x
:
−4
=
15
:
5
5
×
(
−4
)
x
=
−4
×
15
x
=
3
(11)
6
:
−2
=
−2
x
:
−8
−2
×
(
−2
)
x
=
6
×
(
−8
)
x
=
−12
(12)
12
:
−4
x
=
9
:
−12
9
×
(
−4
)
x
=
12
×
(
−12
)
x
=
4
(13)
−
x
:
−3
=
−1
:
1
−1
x
=
−3
×
(
−1
)
x
=
−3
(14)
−2
:
2
=
3
x
:
−3
2
×
3
x
=
−2
×
(
−3
)
x
=
1
(15)
−12
:
3
x
=
1
:
−2
3
x
=
−12
×
(
−2
)
x
=
8
(16)
9
:
15
=
−
x
:
5
15
×
(
−1
)
x
=
9
×
5
x
=
−3