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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
=
x
−
1
:
1
(2)
x
+
3
:
8
=
−5
:
20
(3)
−12
:
−4
x
=
−15
:
5
(4)
−3
:
−
x
=
15
:
20
(5)
−2
x
:
−16
=
5
:
−2
(6)
−5
:
x
−
1
=
−2
:
−8
(7)
x
+
3
:
6
=
3
:
9
(8)
−10
:
2
=
75
:
3
x
(9)
−2
:
1
=
−20
:
−5
x
(10)
5
:
−5
=
3
x
:
−45
(11)
−12
:
3
=
16
:
x
+
4
(12)
4
:
−20
=
−2
:
x
−
4
(13)
3
:
−3
=
−15
:
5
x
(14)
x
+
4
:
3
=
−20
:
5
(15)
4
:
−4
=
5
x
:
20
(16)
5
x
:
−10
=
3
:
−3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−4
:
−2
=
x
−
1
:
1
−2
×
(
x
−
1
)
=
−4
x
−
1
=
2
x
=
3
(2)
x
+
3
:
8
=
−5
:
20
20
×
(
x
+
3
)
=
8
×
(
−5
)
x
+
3
=
−2
x
=
−5
(3)
−12
:
−4
x
=
−15
:
5
−15
×
(
−4
)
x
=
−12
×
5
x
=
−1
(4)
−3
:
−
x
=
15
:
20
15
×
(
−1
)
x
=
−3
×
20
x
=
4
(5)
−2
x
:
−16
=
5
:
−2
−2
×
(
−2
)
x
=
−16
×
5
x
=
−20
(6)
−5
:
x
−
1
=
−2
:
−8
−2
×
(
x
−
1
)
=
−5
×
(
−8
)
x
−
1
=
−20
x
=
−19
(7)
x
+
3
:
6
=
3
:
9
9
×
(
x
+
3
)
=
6
×
3
x
+
3
=
2
x
=
−1
(8)
−10
:
2
=
75
:
3
x
−10
×
3
x
=
2
×
75
x
=
−5
(9)
−2
:
1
=
−20
:
−5
x
−2
×
(
−5
)
x
=
−20
x
=
−2
(10)
5
:
−5
=
3
x
:
−45
−5
×
3
x
=
5
×
(
−45
)
x
=
15
(11)
−12
:
3
=
16
:
x
+
4
−12
×
(
x
+
4
)
=
3
×
16
x
+
4
=
−4
x
=
−8
(12)
4
:
−20
=
−2
:
x
−
4
4
×
(
x
−
4
)
=
−20
×
(
−2
)
x
−
4
=
10
x
=
14
(13)
3
:
−3
=
−15
:
5
x
3
×
5
x
=
−3
×
(
−15
)
x
=
3
(14)
x
+
4
:
3
=
−20
:
5
5
×
(
x
+
4
)
=
3
×
(
−20
)
x
+
4
=
−12
x
=
−16
(15)
4
:
−4
=
5
x
:
20
−4
×
5
x
=
4
×
20
x
=
−4
(16)
5
x
:
−10
=
3
:
−3
−3
×
5
x
=
−10
×
3
x
=
2