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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
:
4
x
=
3
:
15
(2)
−12
:
16
=
−3
:
x
−
5
(3)
2
x
:
8
=
2
:
−1
(4)
−8
:
2
x
=
−20
:
−5
(5)
−5
:
x
−
3
=
4
:
20
(6)
−2
:
4
=
20
:
−5
x
(7)
1
:
−2
=
8
:
4
x
(8)
−10
:
−2
x
=
25
:
5
(9)
−15
:
−3
=
4
x
:
−4
(10)
15
:
5
=
−
x
:
−4
(11)
2
:
2
x
=
2
:
4
(12)
x
+
2
:
2
=
−1
:
1
(13)
−4
:
x
+
5
=
2
:
1
(14)
x
+
2
:
6
=
4
:
3
(15)
1
:
5
=
x
−
4
:
−5
(16)
−15
:
3
=
x
−
2
:
−1
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−4
:
4
x
=
3
:
15
3
×
4
x
=
−4
×
15
x
=
−5
(2)
−12
:
16
=
−3
:
x
−
5
−12
×
(
x
−
5
)
=
16
×
(
−3
)
x
−
5
=
4
x
=
9
(3)
2
x
:
8
=
2
:
−1
−
2
x
=
8
×
2
x
=
−8
(4)
−8
:
2
x
=
−20
:
−5
−20
×
2
x
=
−8
×
(
−5
)
x
=
−1
(5)
−5
:
x
−
3
=
4
:
20
4
×
(
x
−
3
)
=
−5
×
20
x
−
3
=
−25
x
=
−22
(6)
−2
:
4
=
20
:
−5
x
−2
×
(
−5
)
x
=
4
×
20
x
=
8
(7)
1
:
−2
=
8
:
4
x
4
x
=
−2
×
8
x
=
−4
(8)
−10
:
−2
x
=
25
:
5
25
×
(
−2
)
x
=
−10
×
5
x
=
1
(9)
−15
:
−3
=
4
x
:
−4
−3
×
4
x
=
−15
×
(
−4
)
x
=
−5
(10)
15
:
5
=
−
x
:
−4
5
×
(
−1
)
x
=
15
×
(
−4
)
x
=
12
(11)
2
:
2
x
=
2
:
4
2
×
2
x
=
2
×
4
x
=
2
(12)
x
+
2
:
2
=
−1
:
1
x
+
2
=
2
×
(
−1
)
x
+
2
=
−2
x
=
−4
(13)
−4
:
x
+
5
=
2
:
1
2
×
(
x
+
5
)
=
−4
x
+
5
=
−2
x
=
−7
(14)
x
+
2
:
6
=
4
:
3
3
×
(
x
+
2
)
=
6
×
4
x
+
2
=
8
x
=
6
(15)
1
:
5
=
x
−
4
:
−5
5
×
(
x
−
4
)
=
−5
x
−
4
=
−1
x
=
3
(16)
−15
:
3
=
x
−
2
:
−1
3
×
(
x
−
2
)
=
−15
×
(
−1
)
x
−
2
=
5
x
=
7