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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
:
−2
=
4
x
:
40
(2)
−10
:
x
−
3
=
8
:
−4
(3)
40
:
2
x
=
12
:
3
(4)
−9
:
−3
x
=
−1
:
−2
(5)
−2
x
:
−8
=
−10
:
8
(6)
4
:
2
x
=
−6
:
15
(7)
−15
:
x
−
4
=
−3
:
5
(8)
80
:
−4
x
=
−12
:
−3
(9)
−8
:
2
=
x
+
2
:
3
(10)
−
x
:
2
=
12
:
−3
(11)
4
:
−12
=
x
−
3
:
3
(12)
1
:
−1
=
−3
x
:
15
(13)
3
:
−
x
=
15
:
25
(14)
−1
:
x
+
2
=
2
:
6
(15)
−20
:
12
=
10
:
−2
x
(16)
5
:
20
=
x
+
4
:
−16
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−3
:
−2
=
4
x
:
40
−2
×
4
x
=
−3
×
40
x
=
15
(2)
−10
:
x
−
3
=
8
:
−4
8
×
(
x
−
3
)
=
−10
×
(
−4
)
x
−
3
=
5
x
=
8
(3)
40
:
2
x
=
12
:
3
12
×
2
x
=
40
×
3
x
=
5
(4)
−9
:
−3
x
=
−1
:
−2
−
(
−3
)
x
=
−9
×
(
−2
)
x
=
6
(5)
−2
x
:
−8
=
−10
:
8
8
×
(
−2
)
x
=
−8
×
(
−10
)
x
=
−5
(6)
4
:
2
x
=
−6
:
15
−6
×
2
x
=
4
×
15
x
=
−5
(7)
−15
:
x
−
4
=
−3
:
5
−3
×
(
x
−
4
)
=
−15
×
5
x
−
4
=
25
x
=
29
(8)
80
:
−4
x
=
−12
:
−3
−12
×
(
−4
)
x
=
80
×
(
−3
)
x
=
−5
(9)
−8
:
2
=
x
+
2
:
3
2
×
(
x
+
2
)
=
−8
×
3
x
+
2
=
−12
x
=
−14
(10)
−
x
:
2
=
12
:
−3
−3
×
(
−1
)
x
=
2
×
12
x
=
8
(11)
4
:
−12
=
x
−
3
:
3
−12
×
(
x
−
3
)
=
4
×
3
x
−
3
=
−1
x
=
2
(12)
1
:
−1
=
−3
x
:
15
−
(
−3
)
x
=
15
x
=
5
(13)
3
:
−
x
=
15
:
25
15
×
(
−1
)
x
=
3
×
25
x
=
−5
(14)
−1
:
x
+
2
=
2
:
6
2
×
(
x
+
2
)
=
−
6
x
+
2
=
−3
x
=
−5
(15)
−20
:
12
=
10
:
−2
x
−20
×
(
−2
)
x
=
12
×
10
x
=
3
(16)
5
:
20
=
x
+
4
:
−16
20
×
(
x
+
4
)
=
5
×
(
−16
)
x
+
4
=
−4
x
=
−8