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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
:
20
=
1
:
x
−
3
(2)
2
:
−3
=
−4
x
:
−60
(3)
−20
:
x
−
1
=
−16
:
−4
(4)
−3
x
:
−15
=
6
:
−3
(5)
−4
:
−20
=
−2
:
x
+
4
(6)
−2
x
:
4
=
6
:
3
(7)
4
x
:
−8
=
8
:
2
(8)
16
:
−4
=
4
:
x
−
5
(9)
−4
:
16
=
x
+
3
:
8
(10)
4
:
20
=
25
:
5
x
(11)
−2
x
:
12
=
1
:
2
(12)
3
:
−4
=
18
:
2
x
(13)
4
x
:
−12
=
4
:
3
(14)
−20
:
−4
x
=
3
:
−9
(15)
6
:
−6
=
x
+
5
:
3
(16)
−2
:
−5
=
−5
x
:
−50
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
4
:
20
=
1
:
x
−
3
4
×
(
x
−
3
)
=
20
x
−
3
=
5
x
=
8
(2)
2
:
−3
=
−4
x
:
−60
−3
×
(
−4
)
x
=
2
×
(
−60
)
x
=
−10
(3)
−20
:
x
−
1
=
−16
:
−4
−16
×
(
x
−
1
)
=
−20
×
(
−4
)
x
−
1
=
−5
x
=
−4
(4)
−3
x
:
−15
=
6
:
−3
−3
×
(
−3
)
x
=
−15
×
6
x
=
−10
(5)
−4
:
−20
=
−2
:
x
+
4
−4
×
(
x
+
4
)
=
−20
×
(
−2
)
x
+
4
=
−10
x
=
−14
(6)
−2
x
:
4
=
6
:
3
3
×
(
−2
)
x
=
4
×
6
x
=
−4
(7)
4
x
:
−8
=
8
:
2
2
×
4
x
=
−8
×
8
x
=
−8
(8)
16
:
−4
=
4
:
x
−
5
16
×
(
x
−
5
)
=
−4
×
4
x
−
5
=
−1
x
=
4
(9)
−4
:
16
=
x
+
3
:
8
16
×
(
x
+
3
)
=
−4
×
8
x
+
3
=
−2
x
=
−5
(10)
4
:
20
=
25
:
5
x
4
×
5
x
=
20
×
25
x
=
25
(11)
−2
x
:
12
=
1
:
2
2
×
(
−2
)
x
=
12
x
=
−3
(12)
3
:
−4
=
18
:
2
x
3
×
2
x
=
−4
×
18
x
=
−12
(13)
4
x
:
−12
=
4
:
3
3
×
4
x
=
−12
×
4
x
=
−4
(14)
−20
:
−4
x
=
3
:
−9
3
×
(
−4
)
x
=
−20
×
(
−9
)
x
=
−15
(15)
6
:
−6
=
x
+
5
:
3
−6
×
(
x
+
5
)
=
6
×
3
x
+
5
=
−3
x
=
−8
(16)
−2
:
−5
=
−5
x
:
−50
−5
×
(
−5
)
x
=
−2
×
(
−50
)
x
=
4