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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)
−2
:
−3
=
4
:
x
+
3
(2)
−5
:
5
=
−2
:
−2
x
(3)
−2
:
−4
=
4
:
−
x
(4)
4
:
1
=
x
−
5
:
3
(5)
5
:
−3
=
−3
x
:
−27
(6)
15
:
5
=
−12
:
x
−
4
(7)
5
:
1
=
x
−
5
:
−4
(8)
−5
:
4
=
x
−
1
:
8
(9)
1
:
3
=
5
x
:
−15
(10)
−5
:
x
−
3
=
−15
:
−3
(11)
−20
:
5
=
−
x
:
2
(12)
8
:
2
=
20
:
x
+
2
(13)
−2
:
1
=
−2
:
−
x
(14)
−4
:
3
=
x
−
3
:
12
(15)
−2
:
−
x
=
5
:
−5
(16)
x
−
2
:
6
=
2
:
−4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−2
:
−3
=
4
:
x
+
3
−2
×
(
x
+
3
)
=
−3
×
4
x
+
3
=
6
x
=
3
(2)
−5
:
5
=
−2
:
−2
x
−5
×
(
−2
)
x
=
5
×
(
−2
)
x
=
−1
(3)
−2
:
−4
=
4
:
−
x
−2
×
(
−1
)
x
=
−4
×
4
x
=
−8
(4)
4
:
1
=
x
−
5
:
3
x
−
5
=
4
×
3
x
−
5
=
12
x
=
17
(5)
5
:
−3
=
−3
x
:
−27
−3
×
(
−3
)
x
=
5
×
(
−27
)
x
=
−15
(6)
15
:
5
=
−12
:
x
−
4
15
×
(
x
−
4
)
=
5
×
(
−12
)
x
−
4
=
−4
x
=
0
(7)
5
:
1
=
x
−
5
:
−4
x
−
5
=
5
×
(
−4
)
x
−
5
=
−20
x
=
−15
(8)
−5
:
4
=
x
−
1
:
8
4
×
(
x
−
1
)
=
−5
×
8
x
−
1
=
−10
x
=
−9
(9)
1
:
3
=
5
x
:
−15
3
×
5
x
=
−15
x
=
−1
(10)
−5
:
x
−
3
=
−15
:
−3
−15
×
(
x
−
3
)
=
−5
×
(
−3
)
x
−
3
=
−1
x
=
2
(11)
−20
:
5
=
−
x
:
2
5
×
(
−1
)
x
=
−20
×
2
x
=
8
(12)
8
:
2
=
20
:
x
+
2
8
×
(
x
+
2
)
=
2
×
20
x
+
2
=
5
x
=
3
(13)
−2
:
1
=
−2
:
−
x
−2
×
(
−1
)
x
=
−2
x
=
−1
(14)
−4
:
3
=
x
−
3
:
12
3
×
(
x
−
3
)
=
−4
×
12
x
−
3
=
−16
x
=
−13
(15)
−2
:
−
x
=
5
:
−5
5
×
(
−1
)
x
=
−2
×
(
−5
)
x
=
−2
(16)
x
−
2
:
6
=
2
:
−4
−4
×
(
x
−
2
)
=
6
×
2
x
−
2
=
−3
x
=
−1