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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)
−1
:
x
−
2
=
4
:
−20
(2)
6
:
x
+
4
=
9
:
3
(3)
−15
:
−5
=
−60
:
5
x
(4)
3
:
x
−
4
=
−3
:
−6
(5)
−5
:
−4
=
−75
:
−3
x
(6)
−5
:
x
−
5
=
3
:
6
(7)
2
:
x
+
3
=
−6
:
−15
(8)
−4
:
4
=
−
x
:
−1
(9)
−2
:
4
=
x
−
3
:
12
(10)
20
:
−25
=
−3
x
:
−15
(11)
−10
:
2
x
=
−20
:
−4
(12)
−5
:
x
+
5
=
−25
:
20
(13)
−25
:
5
=
x
−
2
:
−1
(14)
−4
:
2
x
=
−6
:
15
(15)
x
−
3
:
−5
=
−4
:
4
(16)
−6
:
3
=
5
x
:
−5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−1
:
x
−
2
=
4
:
−20
4
×
(
x
−
2
)
=
−
(
−20
)
x
−
2
=
5
x
=
7
(2)
6
:
x
+
4
=
9
:
3
9
×
(
x
+
4
)
=
6
×
3
x
+
4
=
2
x
=
−2
(3)
−15
:
−5
=
−60
:
5
x
−15
×
5
x
=
−5
×
(
−60
)
x
=
−4
(4)
3
:
x
−
4
=
−3
:
−6
−3
×
(
x
−
4
)
=
3
×
(
−6
)
x
−
4
=
6
x
=
10
(5)
−5
:
−4
=
−75
:
−3
x
−5
×
(
−3
)
x
=
−4
×
(
−75
)
x
=
20
(6)
−5
:
x
−
5
=
3
:
6
3
×
(
x
−
5
)
=
−5
×
6
x
−
5
=
−10
x
=
−5
(7)
2
:
x
+
3
=
−6
:
−15
−6
×
(
x
+
3
)
=
2
×
(
−15
)
x
+
3
=
5
x
=
2
(8)
−4
:
4
=
−
x
:
−1
4
×
(
−1
)
x
=
−4
×
(
−1
)
x
=
−1
(9)
−2
:
4
=
x
−
3
:
12
4
×
(
x
−
3
)
=
−2
×
12
x
−
3
=
−6
x
=
−3
(10)
20
:
−25
=
−3
x
:
−15
−25
×
(
−3
)
x
=
20
×
(
−15
)
x
=
−4
(11)
−10
:
2
x
=
−20
:
−4
−20
×
2
x
=
−10
×
(
−4
)
x
=
−1
(12)
−5
:
x
+
5
=
−25
:
20
−25
×
(
x
+
5
)
=
−5
×
20
x
+
5
=
4
x
=
−1
(13)
−25
:
5
=
x
−
2
:
−1
5
×
(
x
−
2
)
=
−25
×
(
−1
)
x
−
2
=
5
x
=
7
(14)
−4
:
2
x
=
−6
:
15
−6
×
2
x
=
−4
×
15
x
=
5
(15)
x
−
3
:
−5
=
−4
:
4
4
×
(
x
−
3
)
=
−5
×
(
−4
)
x
−
3
=
5
x
=
8
(16)
−6
:
3
=
5
x
:
−5
3
×
5
x
=
−6
×
(
−5
)
x
=
2