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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
=
6
:
−3
(2)
x
−
3
:
6
=
−3
:
−6
(3)
−1
:
−2
=
x
+
4
:
−10
(4)
−2
:
2
=
−5
:
5
x
(5)
x
−
2
:
−4
=
12
:
−3
(6)
x
+
5
:
−2
=
16
:
4
(7)
4
x
:
−8
=
12
:
−6
(8)
20
:
5
=
−3
x
:
6
(9)
−
x
:
−2
=
−12
:
−8
(10)
3
:
1
=
−60
:
−5
x
(11)
−50
:
−5
x
=
−2
:
2
(12)
−3
x
:
−12
=
1
:
2
(13)
5
:
−1
=
−20
:
x
−
2
(14)
2
:
x
+
2
=
−3
:
−15
(15)
−16
:
−20
=
−16
:
−4
x
(16)
x
+
5
:
−12
=
−1
:
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
:
−
x
=
6
:
−3
6
×
(
−1
)
x
=
2
×
(
−3
)
x
=
1
(2)
x
−
3
:
6
=
−3
:
−6
−6
×
(
x
−
3
)
=
6
×
(
−3
)
x
−
3
=
3
x
=
6
(3)
−1
:
−2
=
x
+
4
:
−10
−2
×
(
x
+
4
)
=
−
(
−10
)
x
+
4
=
−5
x
=
−9
(4)
−2
:
2
=
−5
:
5
x
−2
×
5
x
=
2
×
(
−5
)
x
=
1
(5)
x
−
2
:
−4
=
12
:
−3
−3
×
(
x
−
2
)
=
−4
×
12
x
−
2
=
16
x
=
18
(6)
x
+
5
:
−2
=
16
:
4
4
×
(
x
+
5
)
=
−2
×
16
x
+
5
=
−8
x
=
−13
(7)
4
x
:
−8
=
12
:
−6
−6
×
4
x
=
−8
×
12
x
=
4
(8)
20
:
5
=
−3
x
:
6
5
×
(
−3
)
x
=
20
×
6
x
=
−8
(9)
−
x
:
−2
=
−12
:
−8
−8
×
(
−1
)
x
=
−2
×
(
−12
)
x
=
3
(10)
3
:
1
=
−60
:
−5
x
3
×
(
−5
)
x
=
−60
x
=
4
(11)
−50
:
−5
x
=
−2
:
2
−2
×
(
−5
)
x
=
−50
×
2
x
=
−10
(12)
−3
x
:
−12
=
1
:
2
2
×
(
−3
)
x
=
−12
x
=
2
(13)
5
:
−1
=
−20
:
x
−
2
5
×
(
x
−
2
)
=
−
(
−20
)
x
−
2
=
4
x
=
6
(14)
2
:
x
+
2
=
−3
:
−15
−3
×
(
x
+
2
)
=
2
×
(
−15
)
x
+
2
=
10
x
=
8
(15)
−16
:
−20
=
−16
:
−4
x
−16
×
(
−4
)
x
=
−20
×
(
−16
)
x
=
5
(16)
x
+
5
:
−12
=
−1
:
4
4
×
(
x
+
5
)
=
−12
×
(
−1
)
x
+
5
=
3
x
=
−2