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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
:
−2
=
2
:
x
−
4
(2)
x
+
2
:
−20
=
3
:
−15
(3)
−2
x
:
−4
=
−1
:
1
(4)
−12
:
−8
=
−12
:
−4
x
(5)
−12
:
−16
=
3
:
x
+
4
(6)
−4
:
−12
=
−25
:
−5
x
(7)
−15
:
15
=
−25
:
5
x
(8)
−5
:
15
=
x
−
2
:
−3
(9)
2
:
6
=
1
:
x
−
1
(10)
−2
:
6
=
1
:
x
+
2
(11)
2
:
x
−
3
=
−2
:
4
(12)
2
:
8
=
2
:
−2
x
(13)
15
:
3
=
50
:
5
x
(14)
−4
:
−2
=
10
:
5
x
(15)
−6
:
−3
x
=
1
:
−2
(16)
−4
:
20
=
−2
:
2
x
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−4
:
−2
=
2
:
x
−
4
−4
×
(
x
−
4
)
=
−2
×
2
x
−
4
=
1
x
=
5
(2)
x
+
2
:
−20
=
3
:
−15
−15
×
(
x
+
2
)
=
−20
×
3
x
+
2
=
4
x
=
2
(3)
−2
x
:
−4
=
−1
:
1
−2
x
=
−4
×
(
−1
)
x
=
−2
(4)
−12
:
−8
=
−12
:
−4
x
−12
×
(
−4
)
x
=
−8
×
(
−12
)
x
=
2
(5)
−12
:
−16
=
3
:
x
+
4
−12
×
(
x
+
4
)
=
−16
×
3
x
+
4
=
4
x
=
0
(6)
−4
:
−12
=
−25
:
−5
x
−4
×
(
−5
)
x
=
−12
×
(
−25
)
x
=
15
(7)
−15
:
15
=
−25
:
5
x
−15
×
5
x
=
15
×
(
−25
)
x
=
5
(8)
−5
:
15
=
x
−
2
:
−3
15
×
(
x
−
2
)
=
−5
×
(
−3
)
x
−
2
=
1
x
=
3
(9)
2
:
6
=
1
:
x
−
1
2
×
(
x
−
1
)
=
6
x
−
1
=
3
x
=
4
(10)
−2
:
6
=
1
:
x
+
2
−2
×
(
x
+
2
)
=
6
x
+
2
=
−3
x
=
−5
(11)
2
:
x
−
3
=
−2
:
4
−2
×
(
x
−
3
)
=
2
×
4
x
−
3
=
−4
x
=
−1
(12)
2
:
8
=
2
:
−2
x
2
×
(
−2
)
x
=
8
×
2
x
=
−4
(13)
15
:
3
=
50
:
5
x
15
×
5
x
=
3
×
50
x
=
2
(14)
−4
:
−2
=
10
:
5
x
−4
×
5
x
=
−2
×
10
x
=
1
(15)
−6
:
−3
x
=
1
:
−2
−3
x
=
−6
×
(
−2
)
x
=
−4
(16)
−4
:
20
=
−2
:
2
x
−4
×
2
x
=
20
×
(
−2
)
x
=
5