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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
:
10
=
−6
:
−3
(2)
−4
:
4
=
5
x
:
10
(3)
x
−
5
:
−2
=
6
:
−6
(4)
3
:
−12
=
−10
:
−2
x
(5)
−4
:
8
=
x
+
4
:
2
(6)
8
:
−12
=
x
−
5
:
3
(7)
3
x
:
30
=
1
:
−5
(8)
x
+
3
:
−1
=
2
:
−2
(9)
x
−
3
:
−1
=
−12
:
4
(10)
12
:
4
x
=
9
:
15
(11)
5
:
25
=
−15
:
−5
x
(12)
5
:
−1
=
15
:
−3
x
(13)
12
:
x
+
4
=
−8
:
2
(14)
5
:
−20
=
1
:
x
+
5
(15)
12
:
20
=
3
x
:
15
(16)
x
+
4
:
1
=
12
:
−4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−2
x
:
10
=
−6
:
−3
−3
×
(
−2
)
x
=
10
×
(
−6
)
x
=
−10
(2)
−4
:
4
=
5
x
:
10
4
×
5
x
=
−4
×
10
x
=
−2
(3)
x
−
5
:
−2
=
6
:
−6
−6
×
(
x
−
5
)
=
−2
×
6
x
−
5
=
2
x
=
7
(4)
3
:
−12
=
−10
:
−2
x
3
×
(
−2
)
x
=
−12
×
(
−10
)
x
=
−20
(5)
−4
:
8
=
x
+
4
:
2
8
×
(
x
+
4
)
=
−4
×
2
x
+
4
=
−1
x
=
−5
(6)
8
:
−12
=
x
−
5
:
3
−12
×
(
x
−
5
)
=
8
×
3
x
−
5
=
−2
x
=
3
(7)
3
x
:
30
=
1
:
−5
−5
×
3
x
=
30
x
=
−2
(8)
x
+
3
:
−1
=
2
:
−2
−2
×
(
x
+
3
)
=
−
2
x
+
3
=
1
x
=
−2
(9)
x
−
3
:
−1
=
−12
:
4
4
×
(
x
−
3
)
=
−
(
−12
)
x
−
3
=
3
x
=
6
(10)
12
:
4
x
=
9
:
15
9
×
4
x
=
12
×
15
x
=
5
(11)
5
:
25
=
−15
:
−5
x
5
×
(
−5
)
x
=
25
×
(
−15
)
x
=
15
(12)
5
:
−1
=
15
:
−3
x
5
×
(
−3
)
x
=
−
15
x
=
1
(13)
12
:
x
+
4
=
−8
:
2
−8
×
(
x
+
4
)
=
12
×
2
x
+
4
=
−3
x
=
−7
(14)
5
:
−20
=
1
:
x
+
5
5
×
(
x
+
5
)
=
−20
x
+
5
=
−4
x
=
−9
(15)
12
:
20
=
3
x
:
15
20
×
3
x
=
12
×
15
x
=
3
(16)
x
+
4
:
1
=
12
:
−4
−4
×
(
x
+
4
)
=
12
x
+
4
=
−3
x
=
−7