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