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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)
−100
:
4
x
=
−5
:
2
(2)
8
:
−2
x
=
−2
:
3
(3)
−8
:
20
=
5
x
:
25
(4)
4
:
x
−
5
=
3
:
6
(5)
−4
:
x
−
1
=
−2
:
1
(6)
12
:
−16
=
2
x
:
−8
(7)
−2
x
:
8
=
−12
:
16
(8)
−2
:
5
=
−2
x
:
40
(9)
4
:
1
=
−12
:
x
−
3
(10)
x
−
4
:
3
=
4
:
−1
(11)
3
:
15
=
−2
x
:
20
(12)
−5
:
x
+
2
=
−2
:
−8
(13)
−2
:
6
=
−4
x
:
12
(14)
5
:
x
−
3
=
15
:
9
(15)
−15
:
3
x
=
−4
:
20
(16)
1
:
3
=
x
−
2
:
−3
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−100
:
4
x
=
−5
:
2
−5
×
4
x
=
−100
×
2
x
=
10
(2)
8
:
−2
x
=
−2
:
3
−2
×
(
−2
)
x
=
8
×
3
x
=
6
(3)
−8
:
20
=
5
x
:
25
20
×
5
x
=
−8
×
25
x
=
−2
(4)
4
:
x
−
5
=
3
:
6
3
×
(
x
−
5
)
=
4
×
6
x
−
5
=
8
x
=
13
(5)
−4
:
x
−
1
=
−2
:
1
−2
×
(
x
−
1
)
=
−4
x
−
1
=
2
x
=
3
(6)
12
:
−16
=
2
x
:
−8
−16
×
2
x
=
12
×
(
−8
)
x
=
3
(7)
−2
x
:
8
=
−12
:
16
16
×
(
−2
)
x
=
8
×
(
−12
)
x
=
3
(8)
−2
:
5
=
−2
x
:
40
5
×
(
−2
)
x
=
−2
×
40
x
=
8
(9)
4
:
1
=
−12
:
x
−
3
4
×
(
x
−
3
)
=
−12
x
−
3
=
−3
x
=
0
(10)
x
−
4
:
3
=
4
:
−1
−
(
x
−
4
)
=
3
×
4
x
−
4
=
−12
x
=
−8
(11)
3
:
15
=
−2
x
:
20
15
×
(
−2
)
x
=
3
×
20
x
=
−2
(12)
−5
:
x
+
2
=
−2
:
−8
−2
×
(
x
+
2
)
=
−5
×
(
−8
)
x
+
2
=
−20
x
=
−22
(13)
−2
:
6
=
−4
x
:
12
6
×
(
−4
)
x
=
−2
×
12
x
=
1
(14)
5
:
x
−
3
=
15
:
9
15
×
(
x
−
3
)
=
5
×
9
x
−
3
=
3
x
=
6
(15)
−15
:
3
x
=
−4
:
20
−4
×
3
x
=
−15
×
20
x
=
25
(16)
1
:
3
=
x
−
2
:
−3
3
×
(
x
−
2
)
=
−3
x
−
2
=
−1
x
=
1