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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)
−1
:
x
−
5
=
1
:
−5
(2)
5
:
−5
=
10
:
x
−
5
(3)
−40
:
2
x
=
5
:
−3
(4)
−5
:
3
=
2
x
:
12
(5)
3
:
−12
=
−2
x
:
−8
(6)
3
:
9
=
−2
:
x
+
5
(7)
−4
x
:
−4
=
−4
:
2
(8)
−2
:
−1
=
5
x
:
−20
(9)
9
:
3
=
−5
x
:
5
(10)
−2
:
−6
=
−1
:
x
−
4
(11)
4
:
2
=
−2
x
:
−2
(12)
−15
:
−3
=
x
+
5
:
2
(13)
−5
:
4
=
30
:
3
x
(14)
9
:
−
x
=
6
:
2
(15)
8
:
x
−
1
=
−12
:
3
(16)
50
:
−5
x
=
−5
:
−1
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−1
:
x
−
5
=
1
:
−5
x
−
5
=
−
(
−5
)
x
−
5
=
5
x
=
10
(2)
5
:
−5
=
10
:
x
−
5
5
×
(
x
−
5
)
=
−5
×
10
x
−
5
=
−10
x
=
−5
(3)
−40
:
2
x
=
5
:
−3
5
×
2
x
=
−40
×
(
−3
)
x
=
12
(4)
−5
:
3
=
2
x
:
12
3
×
2
x
=
−5
×
12
x
=
−10
(5)
3
:
−12
=
−2
x
:
−8
−12
×
(
−2
)
x
=
3
×
(
−8
)
x
=
−1
(6)
3
:
9
=
−2
:
x
+
5
3
×
(
x
+
5
)
=
9
×
(
−2
)
x
+
5
=
−6
x
=
−11
(7)
−4
x
:
−4
=
−4
:
2
2
×
(
−4
)
x
=
−4
×
(
−4
)
x
=
−2
(8)
−2
:
−1
=
5
x
:
−20
−
5
x
=
−2
×
(
−20
)
x
=
−8
(9)
9
:
3
=
−5
x
:
5
3
×
(
−5
)
x
=
9
×
5
x
=
−3
(10)
−2
:
−6
=
−1
:
x
−
4
−2
×
(
x
−
4
)
=
−6
×
(
−1
)
x
−
4
=
−3
x
=
1
(11)
4
:
2
=
−2
x
:
−2
2
×
(
−2
)
x
=
4
×
(
−2
)
x
=
2
(12)
−15
:
−3
=
x
+
5
:
2
−3
×
(
x
+
5
)
=
−15
×
2
x
+
5
=
10
x
=
5
(13)
−5
:
4
=
30
:
3
x
−5
×
3
x
=
4
×
30
x
=
−8
(14)
9
:
−
x
=
6
:
2
6
×
(
−1
)
x
=
9
×
2
x
=
−3
(15)
8
:
x
−
1
=
−12
:
3
−12
×
(
x
−
1
)
=
8
×
3
x
−
1
=
−2
x
=
−1
(16)
50
:
−5
x
=
−5
:
−1
−5
×
(
−5
)
x
=
50
×
(
−1
)
x
=
−2