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©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の比例式を解きなさい
[0G1-00]
(1)
−
x
:
−1
=
4
:
2
(2)
−3
:
15
=
x
−
4
:
5
(3)
−5
:
−1
=
50
:
5
x
(4)
5
:
x
−
1
=
15
:
12
(5)
−5
x
:
−25
=
6
:
−15
(6)
4
:
x
+
3
=
−3
:
6
(7)
−10
:
−5
=
5
x
:
10
(8)
−5
:
25
=
−5
:
−5
x
(9)
−12
:
3
=
−40
:
−2
x
(10)
−3
:
−1
=
3
:
x
+
5
(11)
−20
:
x
+
5
=
16
:
−4
(12)
−15
:
5
=
x
−
2
:
−1
(13)
4
x
:
16
=
3
:
−4
(14)
20
:
−2
x
=
−5
:
−1
(15)
−4
:
x
−
3
=
20
:
5
(16)
x
+
3
:
4
=
−15
:
−20
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−
x
:
−1
=
4
:
2
2
×
(
−1
)
x
=
−
4
x
=
2
(2)
−3
:
15
=
x
−
4
:
5
15
×
(
x
−
4
)
=
−3
×
5
x
−
4
=
−1
x
=
3
(3)
−5
:
−1
=
50
:
5
x
−5
×
5
x
=
−
50
x
=
2
(4)
5
:
x
−
1
=
15
:
12
15
×
(
x
−
1
)
=
5
×
12
x
−
1
=
4
x
=
5
(5)
−5
x
:
−25
=
6
:
−15
−15
×
(
−5
)
x
=
−25
×
6
x
=
−2
(6)
4
:
x
+
3
=
−3
:
6
−3
×
(
x
+
3
)
=
4
×
6
x
+
3
=
−8
x
=
−11
(7)
−10
:
−5
=
5
x
:
10
−5
×
5
x
=
−10
×
10
x
=
4
(8)
−5
:
25
=
−5
:
−5
x
−5
×
(
−5
)
x
=
25
×
(
−5
)
x
=
−5
(9)
−12
:
3
=
−40
:
−2
x
−12
×
(
−2
)
x
=
3
×
(
−40
)
x
=
−5
(10)
−3
:
−1
=
3
:
x
+
5
−3
×
(
x
+
5
)
=
−
3
x
+
5
=
1
x
=
−4
(11)
−20
:
x
+
5
=
16
:
−4
16
×
(
x
+
5
)
=
−20
×
(
−4
)
x
+
5
=
5
x
=
0
(12)
−15
:
5
=
x
−
2
:
−1
5
×
(
x
−
2
)
=
−15
×
(
−1
)
x
−
2
=
3
x
=
5
(13)
4
x
:
16
=
3
:
−4
−4
×
4
x
=
16
×
3
x
=
−3
(14)
20
:
−2
x
=
−5
:
−1
−5
×
(
−2
)
x
=
20
×
(
−1
)
x
=
−2
(15)
−4
:
x
−
3
=
20
:
5
20
×
(
x
−
3
)
=
−4
×
5
x
−
3
=
−1
x
=
2
(16)
x
+
3
:
4
=
−15
:
−20
−20
×
(
x
+
3
)
=
4
×
(
−15
)
x
+
3
=
3
x
=
0