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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
:
1
=
x
−
3
:
−4
(2)
3
:
−9
=
1
:
x
+
2
(3)
3
:
−2
=
−4
x
:
−8
(4)
2
:
−8
=
x
−
5
:
8
(5)
−2
:
8
=
−1
:
x
+
3
(6)
16
:
−4
=
4
x
:
20
(7)
x
+
2
:
2
=
12
:
−3
(8)
−2
x
:
24
=
−1
:
−3
(9)
15
:
5
=
2
x
:
−2
(10)
5
:
25
=
−3
x
:
−30
(11)
5
:
−5
=
1
:
x
+
5
(12)
−3
:
x
+
5
=
−2
:
2
(13)
x
−
2
:
−8
=
5
:
2
(14)
4
:
x
−
1
=
−2
:
8
(15)
−5
:
−4
=
−15
:
x
−
3
(16)
2
:
−4
=
−1
:
x
−
5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−2
:
1
=
x
−
3
:
−4
x
−
3
=
−2
×
(
−4
)
x
−
3
=
8
x
=
11
(2)
3
:
−9
=
1
:
x
+
2
3
×
(
x
+
2
)
=
−9
x
+
2
=
−3
x
=
−5
(3)
3
:
−2
=
−4
x
:
−8
−2
×
(
−4
)
x
=
3
×
(
−8
)
x
=
−3
(4)
2
:
−8
=
x
−
5
:
8
−8
×
(
x
−
5
)
=
2
×
8
x
−
5
=
−2
x
=
3
(5)
−2
:
8
=
−1
:
x
+
3
−2
×
(
x
+
3
)
=
8
×
(
−1
)
x
+
3
=
4
x
=
1
(6)
16
:
−4
=
4
x
:
20
−4
×
4
x
=
16
×
20
x
=
−20
(7)
x
+
2
:
2
=
12
:
−3
−3
×
(
x
+
2
)
=
2
×
12
x
+
2
=
−8
x
=
−10
(8)
−2
x
:
24
=
−1
:
−3
−3
×
(
−2
)
x
=
24
×
(
−1
)
x
=
−4
(9)
15
:
5
=
2
x
:
−2
5
×
2
x
=
15
×
(
−2
)
x
=
−3
(10)
5
:
25
=
−3
x
:
−30
25
×
(
−3
)
x
=
5
×
(
−30
)
x
=
2
(11)
5
:
−5
=
1
:
x
+
5
5
×
(
x
+
5
)
=
−5
x
+
5
=
−1
x
=
−6
(12)
−3
:
x
+
5
=
−2
:
2
−2
×
(
x
+
5
)
=
−3
×
2
x
+
5
=
3
x
=
−2
(13)
x
−
2
:
−8
=
5
:
2
2
×
(
x
−
2
)
=
−8
×
5
x
−
2
=
−20
x
=
−18
(14)
4
:
x
−
1
=
−2
:
8
−2
×
(
x
−
1
)
=
4
×
8
x
−
1
=
−16
x
=
−15
(15)
−5
:
−4
=
−15
:
x
−
3
−5
×
(
x
−
3
)
=
−4
×
(
−15
)
x
−
3
=
−12
x
=
−9
(16)
2
:
−4
=
−1
:
x
−
5
2
×
(
x
−
5
)
=
−4
×
(
−1
)
x
−
5
=
2
x
=
7