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