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