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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)
−5
:
−2
=
5
:
x
−
3
(2)
−4
x
:
20
=
−20
:
20
(3)
x
+
4
:
−3
=
−4
:
−12
(4)
−9
:
12
=
x
+
2
:
4
(5)
6
:
x
+
5
=
12
:
−4
(6)
5
:
2
=
x
−
2
:
−8
(7)
2
:
−8
=
−3
:
−3
x
(8)
x
+
3
:
−20
=
4
:
5
(9)
−25
:
5
=
4
x
:
−12
(10)
−8
:
20
=
x
+
3
:
5
(11)
−3
:
9
=
5
x
:
−15
(12)
4
x
:
−8
=
8
:
−8
(13)
−4
x
:
−4
=
−25
:
5
(14)
x
−
2
:
4
=
5
:
−20
(15)
2
:
−6
=
4
:
−4
x
(16)
x
+
5
:
15
=
3
:
−9
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−5
:
−2
=
5
:
x
−
3
−5
×
(
x
−
3
)
=
−2
×
5
x
−
3
=
2
x
=
5
(2)
−4
x
:
20
=
−20
:
20
20
×
(
−4
)
x
=
20
×
(
−20
)
x
=
5
(3)
x
+
4
:
−3
=
−4
:
−12
−12
×
(
x
+
4
)
=
−3
×
(
−4
)
x
+
4
=
−1
x
=
−5
(4)
−9
:
12
=
x
+
2
:
4
12
×
(
x
+
2
)
=
−9
×
4
x
+
2
=
−3
x
=
−5
(5)
6
:
x
+
5
=
12
:
−4
12
×
(
x
+
5
)
=
6
×
(
−4
)
x
+
5
=
−2
x
=
−7
(6)
5
:
2
=
x
−
2
:
−8
2
×
(
x
−
2
)
=
5
×
(
−8
)
x
−
2
=
−20
x
=
−18
(7)
2
:
−8
=
−3
:
−3
x
2
×
(
−3
)
x
=
−8
×
(
−3
)
x
=
−4
(8)
x
+
3
:
−20
=
4
:
5
5
×
(
x
+
3
)
=
−20
×
4
x
+
3
=
−16
x
=
−19
(9)
−25
:
5
=
4
x
:
−12
5
×
4
x
=
−25
×
(
−12
)
x
=
15
(10)
−8
:
20
=
x
+
3
:
5
20
×
(
x
+
3
)
=
−8
×
5
x
+
3
=
−2
x
=
−5
(11)
−3
:
9
=
5
x
:
−15
9
×
5
x
=
−3
×
(
−15
)
x
=
1
(12)
4
x
:
−8
=
8
:
−8
−8
×
4
x
=
−8
×
8
x
=
2
(13)
−4
x
:
−4
=
−25
:
5
5
×
(
−4
)
x
=
−4
×
(
−25
)
x
=
−5
(14)
x
−
2
:
4
=
5
:
−20
−20
×
(
x
−
2
)
=
4
×
5
x
−
2
=
−1
x
=
1
(15)
2
:
−6
=
4
:
−4
x
2
×
(
−4
)
x
=
−6
×
4
x
=
3
(16)
x
+
5
:
15
=
3
:
−9
−9
×
(
x
+
5
)
=
15
×
3
x
+
5
=
−5
x
=
−10