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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
:
−1
=
6
:
x
+
4
(2)
−2
:
8
=
25
:
5
x
(3)
−4
:
10
=
2
:
−
x
(4)
5
x
:
−20
=
−6
:
8
(5)
−1
:
3
=
x
−
3
:
−3
(6)
−4
:
−20
=
−
x
:
10
(7)
−24
:
−2
x
=
3
:
5
(8)
−4
:
4
=
x
−
1
:
1
(9)
60
:
3
x
=
−25
:
−5
(10)
−4
:
−4
x
=
−1
:
−3
(11)
−8
:
−2
x
=
2
:
1
(12)
x
+
5
:
−2
=
−3
:
−6
(13)
8
:
−16
=
−2
:
x
−
3
(14)
−2
:
−5
=
10
:
x
−
4
(15)
−3
:
2
=
x
+
4
:
−4
(16)
20
:
5
=
x
+
4
:
−3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
:
−1
=
6
:
x
+
4
2
×
(
x
+
4
)
=
−
6
x
+
4
=
−3
x
=
−7
(2)
−2
:
8
=
25
:
5
x
−2
×
5
x
=
8
×
25
x
=
−20
(3)
−4
:
10
=
2
:
−
x
−4
×
(
−1
)
x
=
10
×
2
x
=
5
(4)
5
x
:
−20
=
−6
:
8
8
×
5
x
=
−20
×
(
−6
)
x
=
3
(5)
−1
:
3
=
x
−
3
:
−3
3
×
(
x
−
3
)
=
−
(
−3
)
x
−
3
=
1
x
=
4
(6)
−4
:
−20
=
−
x
:
10
−20
×
(
−1
)
x
=
−4
×
10
x
=
−2
(7)
−24
:
−2
x
=
3
:
5
3
×
(
−2
)
x
=
−24
×
5
x
=
20
(8)
−4
:
4
=
x
−
1
:
1
4
×
(
x
−
1
)
=
−4
x
−
1
=
−1
x
=
0
(9)
60
:
3
x
=
−25
:
−5
−25
×
3
x
=
60
×
(
−5
)
x
=
4
(10)
−4
:
−4
x
=
−1
:
−3
−
(
−4
)
x
=
−4
×
(
−3
)
x
=
3
(11)
−8
:
−2
x
=
2
:
1
2
×
(
−2
)
x
=
−8
x
=
2
(12)
x
+
5
:
−2
=
−3
:
−6
−6
×
(
x
+
5
)
=
−2
×
(
−3
)
x
+
5
=
−1
x
=
−6
(13)
8
:
−16
=
−2
:
x
−
3
8
×
(
x
−
3
)
=
−16
×
(
−2
)
x
−
3
=
4
x
=
7
(14)
−2
:
−5
=
10
:
x
−
4
−2
×
(
x
−
4
)
=
−5
×
10
x
−
4
=
25
x
=
29
(15)
−3
:
2
=
x
+
4
:
−4
2
×
(
x
+
4
)
=
−3
×
(
−4
)
x
+
4
=
6
x
=
2
(16)
20
:
5
=
x
+
4
:
−3
5
×
(
x
+
4
)
=
20
×
(
−3
)
x
+
4
=
−12
x
=
−16