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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
:
−10
=
x
−
4
:
−5
(2)
24
:
4
x
=
2
:
5
(3)
x
−
1
:
6
=
−2
:
2
(4)
5
:
1
=
−30
:
2
x
(5)
40
:
−4
x
=
−25
:
5
(6)
x
−
5
:
4
=
−3
:
3
(7)
−1
:
−4
=
x
−
5
:
−8
(8)
2
:
10
=
x
−
3
:
−15
(9)
−2
x
:
−20
=
2
:
4
(10)
2
:
x
+
4
=
−6
:
−3
(11)
−4
:
3
=
16
:
x
−
2
(12)
−8
:
6
=
x
+
3
:
3
(13)
4
:
12
=
−5
x
:
−45
(14)
−10
:
20
=
−8
:
4
x
(15)
20
:
−2
x
=
−6
:
3
(16)
−4
:
−5
=
−16
:
−4
x
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
:
−10
=
x
−
4
:
−5
−10
×
(
x
−
4
)
=
2
×
(
−5
)
x
−
4
=
1
x
=
5
(2)
24
:
4
x
=
2
:
5
2
×
4
x
=
24
×
5
x
=
15
(3)
x
−
1
:
6
=
−2
:
2
2
×
(
x
−
1
)
=
6
×
(
−2
)
x
−
1
=
−6
x
=
−5
(4)
5
:
1
=
−30
:
2
x
5
×
2
x
=
−30
x
=
−3
(5)
40
:
−4
x
=
−25
:
5
−25
×
(
−4
)
x
=
40
×
5
x
=
2
(6)
x
−
5
:
4
=
−3
:
3
3
×
(
x
−
5
)
=
4
×
(
−3
)
x
−
5
=
−4
x
=
1
(7)
−1
:
−4
=
x
−
5
:
−8
−4
×
(
x
−
5
)
=
−
(
−8
)
x
−
5
=
−2
x
=
3
(8)
2
:
10
=
x
−
3
:
−15
10
×
(
x
−
3
)
=
2
×
(
−15
)
x
−
3
=
−3
x
=
0
(9)
−2
x
:
−20
=
2
:
4
4
×
(
−2
)
x
=
−20
×
2
x
=
5
(10)
2
:
x
+
4
=
−6
:
−3
−6
×
(
x
+
4
)
=
2
×
(
−3
)
x
+
4
=
1
x
=
−3
(11)
−4
:
3
=
16
:
x
−
2
−4
×
(
x
−
2
)
=
3
×
16
x
−
2
=
−12
x
=
−10
(12)
−8
:
6
=
x
+
3
:
3
6
×
(
x
+
3
)
=
−8
×
3
x
+
3
=
−4
x
=
−7
(13)
4
:
12
=
−5
x
:
−45
12
×
(
−5
)
x
=
4
×
(
−45
)
x
=
3
(14)
−10
:
20
=
−8
:
4
x
−10
×
4
x
=
20
×
(
−8
)
x
=
4
(15)
20
:
−2
x
=
−6
:
3
−6
×
(
−2
)
x
=
20
×
3
x
=
5
(16)
−4
:
−5
=
−16
:
−4
x
−4
×
(
−4
)
x
=
−5
×
(
−16
)
x
=
5