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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)
4
:
−4
=
−3
:
−
x
(2)
−3
x
:
−36
=
−4
:
3
(3)
16
:
4
x
=
16
:
20
(4)
−2
:
−6
=
15
:
−3
x
(5)
2
:
4
=
−1
:
x
−
1
(6)
−20
:
25
=
−2
x
:
10
(7)
−20
:
−15
=
x
+
4
:
−3
(8)
−2
:
−4
=
−10
:
−
x
(9)
−2
:
x
+
4
=
4
:
8
(10)
x
+
5
:
2
=
−10
:
−4
(11)
2
:
−6
=
x
−
4
:
3
(12)
−4
:
−2
=
3
x
:
−9
(13)
x
−
5
:
−3
=
−20
:
−4
(14)
−10
:
−2
=
−5
:
x
−
5
(15)
−5
x
:
−125
=
3
:
−15
(16)
−5
x
:
100
=
2
:
−8
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
4
:
−4
=
−3
:
−
x
4
×
(
−1
)
x
=
−4
×
(
−3
)
x
=
−3
(2)
−3
x
:
−36
=
−4
:
3
3
×
(
−3
)
x
=
−36
×
(
−4
)
x
=
−16
(3)
16
:
4
x
=
16
:
20
16
×
4
x
=
16
×
20
x
=
5
(4)
−2
:
−6
=
15
:
−3
x
−2
×
(
−3
)
x
=
−6
×
15
x
=
−15
(5)
2
:
4
=
−1
:
x
−
1
2
×
(
x
−
1
)
=
4
×
(
−1
)
x
−
1
=
−2
x
=
−1
(6)
−20
:
25
=
−2
x
:
10
25
×
(
−2
)
x
=
−20
×
10
x
=
4
(7)
−20
:
−15
=
x
+
4
:
−3
−15
×
(
x
+
4
)
=
−20
×
(
−3
)
x
+
4
=
−4
x
=
−8
(8)
−2
:
−4
=
−10
:
−
x
−2
×
(
−1
)
x
=
−4
×
(
−10
)
x
=
20
(9)
−2
:
x
+
4
=
4
:
8
4
×
(
x
+
4
)
=
−2
×
8
x
+
4
=
−4
x
=
−8
(10)
x
+
5
:
2
=
−10
:
−4
−4
×
(
x
+
5
)
=
2
×
(
−10
)
x
+
5
=
5
x
=
0
(11)
2
:
−6
=
x
−
4
:
3
−6
×
(
x
−
4
)
=
2
×
3
x
−
4
=
−1
x
=
3
(12)
−4
:
−2
=
3
x
:
−9
−2
×
3
x
=
−4
×
(
−9
)
x
=
−6
(13)
x
−
5
:
−3
=
−20
:
−4
−4
×
(
x
−
5
)
=
−3
×
(
−20
)
x
−
5
=
−15
x
=
−10
(14)
−10
:
−2
=
−5
:
x
−
5
−10
×
(
x
−
5
)
=
−2
×
(
−5
)
x
−
5
=
−1
x
=
4
(15)
−5
x
:
−125
=
3
:
−15
−15
×
(
−5
)
x
=
−125
×
3
x
=
−5
(16)
−5
x
:
100
=
2
:
−8
−8
×
(
−5
)
x
=
100
×
2
x
=
5