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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)
3
:
12
=
−1
:
x
−
3
(2)
x
+
5
:
−2
=
−16
:
4
(3)
−1
:
2
=
5
x
:
40
(4)
2
:
−10
=
6
:
−3
x
(5)
−1
:
x
+
4
=
4
:
−12
(6)
4
x
:
−12
=
4
:
6
(7)
10
:
2
=
125
:
−5
x
(8)
20
:
−20
=
x
+
2
:
4
(9)
4
:
−
x
=
−8
:
−2
(10)
15
:
−3
x
=
−3
:
6
(11)
3
x
:
27
=
−2
:
3
(12)
20
:
x
−
5
=
−10
:
−2
(13)
x
+
3
:
1
=
−12
:
−4
(14)
8
:
x
+
2
=
−4
:
−2
(15)
−3
:
2
=
x
−
4
:
8
(16)
−6
:
−3
x
=
4
:
2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
3
:
12
=
−1
:
x
−
3
3
×
(
x
−
3
)
=
12
×
(
−1
)
x
−
3
=
−4
x
=
−1
(2)
x
+
5
:
−2
=
−16
:
4
4
×
(
x
+
5
)
=
−2
×
(
−16
)
x
+
5
=
8
x
=
3
(3)
−1
:
2
=
5
x
:
40
2
×
5
x
=
−
40
x
=
−4
(4)
2
:
−10
=
6
:
−3
x
2
×
(
−3
)
x
=
−10
×
6
x
=
10
(5)
−1
:
x
+
4
=
4
:
−12
4
×
(
x
+
4
)
=
−
(
−12
)
x
+
4
=
3
x
=
−1
(6)
4
x
:
−12
=
4
:
6
6
×
4
x
=
−12
×
4
x
=
−2
(7)
10
:
2
=
125
:
−5
x
10
×
(
−5
)
x
=
2
×
125
x
=
−5
(8)
20
:
−20
=
x
+
2
:
4
−20
×
(
x
+
2
)
=
20
×
4
x
+
2
=
−4
x
=
−6
(9)
4
:
−
x
=
−8
:
−2
−8
×
(
−1
)
x
=
4
×
(
−2
)
x
=
−1
(10)
15
:
−3
x
=
−3
:
6
−3
×
(
−3
)
x
=
15
×
6
x
=
10
(11)
3
x
:
27
=
−2
:
3
3
×
3
x
=
27
×
(
−2
)
x
=
−6
(12)
20
:
x
−
5
=
−10
:
−2
−10
×
(
x
−
5
)
=
20
×
(
−2
)
x
−
5
=
4
x
=
9
(13)
x
+
3
:
1
=
−12
:
−4
−4
×
(
x
+
3
)
=
−12
x
+
3
=
3
x
=
0
(14)
8
:
x
+
2
=
−4
:
−2
−4
×
(
x
+
2
)
=
8
×
(
−2
)
x
+
2
=
4
x
=
2
(15)
−3
:
2
=
x
−
4
:
8
2
×
(
x
−
4
)
=
−3
×
8
x
−
4
=
−12
x
=
−8
(16)
−6
:
−3
x
=
4
:
2
4
×
(
−3
)
x
=
−6
×
2
x
=
1