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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)
−15
:
5
x
=
4
:
8
(2)
−15
:
−3
x
=
−5
:
−4
(3)
4
:
1
=
−8
:
x
−
1
(4)
1
:
−2
=
−8
:
−4
x
(5)
3
:
1
=
x
−
4
:
−5
(6)
−3
:
−12
=
12
:
−3
x
(7)
−1
:
−2
=
x
+
4
:
10
(8)
−9
:
−6
=
x
−
1
:
2
(9)
15
:
3
=
10
:
x
−
1
(10)
40
:
−2
x
=
25
:
5
(11)
−24
:
3
x
=
−2
:
−1
(12)
−2
:
−1
=
x
+
3
:
4
(13)
4
x
:
−16
=
−4
:
−8
(14)
2
x
:
6
=
−10
:
5
(15)
3
:
−12
=
x
+
3
:
−20
(16)
4
x
:
−60
=
2
:
−10
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−15
:
5
x
=
4
:
8
4
×
5
x
=
−15
×
8
x
=
−6
(2)
−15
:
−3
x
=
−5
:
−4
−5
×
(
−3
)
x
=
−15
×
(
−4
)
x
=
4
(3)
4
:
1
=
−8
:
x
−
1
4
×
(
x
−
1
)
=
−8
x
−
1
=
−2
x
=
−1
(4)
1
:
−2
=
−8
:
−4
x
−4
x
=
−2
×
(
−8
)
x
=
−4
(5)
3
:
1
=
x
−
4
:
−5
x
−
4
=
3
×
(
−5
)
x
−
4
=
−15
x
=
−11
(6)
−3
:
−12
=
12
:
−3
x
−3
×
(
−3
)
x
=
−12
×
12
x
=
−16
(7)
−1
:
−2
=
x
+
4
:
10
−2
×
(
x
+
4
)
=
−
10
x
+
4
=
5
x
=
1
(8)
−9
:
−6
=
x
−
1
:
2
−6
×
(
x
−
1
)
=
−9
×
2
x
−
1
=
3
x
=
4
(9)
15
:
3
=
10
:
x
−
1
15
×
(
x
−
1
)
=
3
×
10
x
−
1
=
2
x
=
3
(10)
40
:
−2
x
=
25
:
5
25
×
(
−2
)
x
=
40
×
5
x
=
−4
(11)
−24
:
3
x
=
−2
:
−1
−2
×
3
x
=
−24
×
(
−1
)
x
=
−4
(12)
−2
:
−1
=
x
+
3
:
4
−
(
x
+
3
)
=
−2
×
4
x
+
3
=
8
x
=
5
(13)
4
x
:
−16
=
−4
:
−8
−8
×
4
x
=
−16
×
(
−4
)
x
=
−2
(14)
2
x
:
6
=
−10
:
5
5
×
2
x
=
6
×
(
−10
)
x
=
−6
(15)
3
:
−12
=
x
+
3
:
−20
−12
×
(
x
+
3
)
=
3
×
(
−20
)
x
+
3
=
5
x
=
2
(16)
4
x
:
−60
=
2
:
−10
−10
×
4
x
=
−60
×
2
x
=
3