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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
x
:
−2
=
4
:
−2
(2)
−4
:
x
+
4
=
4
:
1
(3)
−1
:
1
=
1
:
x
−
5
(4)
2
:
x
−
3
=
−6
:
−3
(5)
20
:
5
x
=
−4
:
3
(6)
12
:
−15
=
−12
:
3
x
(7)
x
−
4
:
−9
=
−3
:
3
(8)
x
+
5
:
15
=
5
:
25
(9)
5
x
:
−50
=
3
:
−5
(10)
−12
:
3
=
−32
:
−2
x
(11)
−3
:
−12
=
x
+
5
:
−8
(12)
5
:
x
−
2
=
−3
:
3
(13)
−5
:
−10
=
x
+
5
:
−4
(14)
−4
:
1
=
60
:
−5
x
(15)
−4
:
4
=
2
:
−2
x
(16)
−1
:
x
−
1
=
−2
:
−4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
x
:
−2
=
4
:
−2
−2
×
2
x
=
−2
×
4
x
=
2
(2)
−4
:
x
+
4
=
4
:
1
4
×
(
x
+
4
)
=
−4
x
+
4
=
−1
x
=
−5
(3)
−1
:
1
=
1
:
x
−
5
−
(
x
−
5
)
=
1
x
−
5
=
−1
x
=
4
(4)
2
:
x
−
3
=
−6
:
−3
−6
×
(
x
−
3
)
=
2
×
(
−3
)
x
−
3
=
1
x
=
4
(5)
20
:
5
x
=
−4
:
3
−4
×
5
x
=
20
×
3
x
=
−3
(6)
12
:
−15
=
−12
:
3
x
12
×
3
x
=
−15
×
(
−12
)
x
=
5
(7)
x
−
4
:
−9
=
−3
:
3
3
×
(
x
−
4
)
=
−9
×
(
−3
)
x
−
4
=
9
x
=
13
(8)
x
+
5
:
15
=
5
:
25
25
×
(
x
+
5
)
=
15
×
5
x
+
5
=
3
x
=
−2
(9)
5
x
:
−50
=
3
:
−5
−5
×
5
x
=
−50
×
3
x
=
6
(10)
−12
:
3
=
−32
:
−2
x
−12
×
(
−2
)
x
=
3
×
(
−32
)
x
=
−4
(11)
−3
:
−12
=
x
+
5
:
−8
−12
×
(
x
+
5
)
=
−3
×
(
−8
)
x
+
5
=
−2
x
=
−7
(12)
5
:
x
−
2
=
−3
:
3
−3
×
(
x
−
2
)
=
5
×
3
x
−
2
=
−5
x
=
−3
(13)
−5
:
−10
=
x
+
5
:
−4
−10
×
(
x
+
5
)
=
−5
×
(
−4
)
x
+
5
=
−2
x
=
−7
(14)
−4
:
1
=
60
:
−5
x
−4
×
(
−5
)
x
=
60
x
=
3
(15)
−4
:
4
=
2
:
−2
x
−4
×
(
−2
)
x
=
4
×
2
x
=
1
(16)
−1
:
x
−
1
=
−2
:
−4
−2
×
(
x
−
1
)
=
−
(
−4
)
x
−
1
=
−2
x
=
−1