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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
:
−1
=
x
+
3
:
−2
(2)
5
:
−25
=
x
+
4
:
−20
(3)
x
−
3
:
1
=
−3
:
−1
(4)
2
:
4
=
−2
:
x
+
4
(5)
−2
:
1
=
8
:
2
x
(6)
5
x
:
80
=
−4
:
−16
(7)
4
:
2
=
−5
x
:
−25
(8)
15
:
3
=
x
−
3
:
2
(9)
−4
:
−8
=
−3
x
:
−30
(10)
−5
:
−1
=
−3
x
:
12
(11)
2
x
:
−4
=
−12
:
−6
(12)
9
:
−3
=
−2
x
:
−4
(13)
−3
:
−5
=
2
x
:
−50
(14)
−16
:
−4
=
−20
:
5
x
(15)
x
−
1
:
9
=
−1
:
3
(16)
−20
:
4
x
=
−1
:
1
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−4
:
−1
=
x
+
3
:
−2
−
(
x
+
3
)
=
−4
×
(
−2
)
x
+
3
=
−8
x
=
−11
(2)
5
:
−25
=
x
+
4
:
−20
−25
×
(
x
+
4
)
=
5
×
(
−20
)
x
+
4
=
4
x
=
0
(3)
x
−
3
:
1
=
−3
:
−1
−
(
x
−
3
)
=
−3
x
−
3
=
3
x
=
6
(4)
2
:
4
=
−2
:
x
+
4
2
×
(
x
+
4
)
=
4
×
(
−2
)
x
+
4
=
−4
x
=
−8
(5)
−2
:
1
=
8
:
2
x
−2
×
2
x
=
8
x
=
−2
(6)
5
x
:
80
=
−4
:
−16
−16
×
5
x
=
80
×
(
−4
)
x
=
4
(7)
4
:
2
=
−5
x
:
−25
2
×
(
−5
)
x
=
4
×
(
−25
)
x
=
10
(8)
15
:
3
=
x
−
3
:
2
3
×
(
x
−
3
)
=
15
×
2
x
−
3
=
10
x
=
13
(9)
−4
:
−8
=
−3
x
:
−30
−8
×
(
−3
)
x
=
−4
×
(
−30
)
x
=
5
(10)
−5
:
−1
=
−3
x
:
12
−
(
−3
)
x
=
−5
×
12
x
=
−20
(11)
2
x
:
−4
=
−12
:
−6
−6
×
2
x
=
−4
×
(
−12
)
x
=
−4
(12)
9
:
−3
=
−2
x
:
−4
−3
×
(
−2
)
x
=
9
×
(
−4
)
x
=
−6
(13)
−3
:
−5
=
2
x
:
−50
−5
×
2
x
=
−3
×
(
−50
)
x
=
−15
(14)
−16
:
−4
=
−20
:
5
x
−16
×
5
x
=
−4
×
(
−20
)
x
=
−1
(15)
x
−
1
:
9
=
−1
:
3
3
×
(
x
−
1
)
=
9
×
(
−1
)
x
−
1
=
−3
x
=
−2
(16)
−20
:
4
x
=
−1
:
1
−
4
x
=
−20
x
=
5