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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)
−20
:
−4
=
x
−
5
:
5
(2)
−10
:
5
=
x
+
4
:
−2
(3)
5
:
−15
=
−4
:
2
x
(4)
−3
:
x
−
2
=
6
:
2
(5)
−5
:
−1
=
20
:
4
x
(6)
−8
:
−2
=
x
−
2
:
5
(7)
−5
:
5
=
4
:
−4
x
(8)
x
+
3
:
4
=
−3
:
−6
(9)
−4
x
:
32
=
−3
:
−6
(10)
6
:
−2
=
x
−
1
:
2
(11)
−2
:
−5
=
x
−
2
:
25
(12)
−2
:
6
=
5
x
:
−45
(13)
4
:
−3
=
−64
:
4
x
(14)
−5
:
−3
=
2
x
:
6
(15)
5
x
:
−15
=
−20
:
15
(16)
3
:
−6
=
−5
:
x
+
3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−20
:
−4
=
x
−
5
:
5
−4
×
(
x
−
5
)
=
−20
×
5
x
−
5
=
25
x
=
30
(2)
−10
:
5
=
x
+
4
:
−2
5
×
(
x
+
4
)
=
−10
×
(
−2
)
x
+
4
=
4
x
=
0
(3)
5
:
−15
=
−4
:
2
x
5
×
2
x
=
−15
×
(
−4
)
x
=
6
(4)
−3
:
x
−
2
=
6
:
2
6
×
(
x
−
2
)
=
−3
×
2
x
−
2
=
−1
x
=
1
(5)
−5
:
−1
=
20
:
4
x
−5
×
4
x
=
−
20
x
=
1
(6)
−8
:
−2
=
x
−
2
:
5
−2
×
(
x
−
2
)
=
−8
×
5
x
−
2
=
20
x
=
22
(7)
−5
:
5
=
4
:
−4
x
−5
×
(
−4
)
x
=
5
×
4
x
=
1
(8)
x
+
3
:
4
=
−3
:
−6
−6
×
(
x
+
3
)
=
4
×
(
−3
)
x
+
3
=
2
x
=
−1
(9)
−4
x
:
32
=
−3
:
−6
−6
×
(
−4
)
x
=
32
×
(
−3
)
x
=
−4
(10)
6
:
−2
=
x
−
1
:
2
−2
×
(
x
−
1
)
=
6
×
2
x
−
1
=
−6
x
=
−5
(11)
−2
:
−5
=
x
−
2
:
25
−5
×
(
x
−
2
)
=
−2
×
25
x
−
2
=
10
x
=
12
(12)
−2
:
6
=
5
x
:
−45
6
×
5
x
=
−2
×
(
−45
)
x
=
3
(13)
4
:
−3
=
−64
:
4
x
4
×
4
x
=
−3
×
(
−64
)
x
=
12
(14)
−5
:
−3
=
2
x
:
6
−3
×
2
x
=
−5
×
6
x
=
5
(15)
5
x
:
−15
=
−20
:
15
15
×
5
x
=
−15
×
(
−20
)
x
=
4
(16)
3
:
−6
=
−5
:
x
+
3
3
×
(
x
+
3
)
=
−6
×
(
−5
)
x
+
3
=
10
x
=
7