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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)
x
+
5
:
8
=
5
:
2
(2)
4
:
x
+
4
=
−12
:
−3
(3)
1
:
5
=
−4
:
4
x
(4)
−36
:
3
x
=
−16
:
4
(5)
10
:
x
−
3
=
−5
:
−1
(6)
−6
:
−3
=
24
:
−3
x
(7)
4
:
5
=
−2
x
:
−30
(8)
2
x
:
−8
=
1
:
4
(9)
3
x
:
−27
=
2
:
−3
(10)
x
+
3
:
−3
=
−15
:
−5
(11)
−12
:
−4
x
=
−1
:
2
(12)
−2
:
−1
=
x
+
2
:
3
(13)
−2
:
2
=
−4
x
:
−4
(14)
−5
:
5
=
−
x
:
1
(15)
−1
:
−2
=
4
x
:
32
(16)
−1
:
−
x
=
3
:
−3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
+
5
:
8
=
5
:
2
2
×
(
x
+
5
)
=
8
×
5
x
+
5
=
20
x
=
15
(2)
4
:
x
+
4
=
−12
:
−3
−12
×
(
x
+
4
)
=
4
×
(
−3
)
x
+
4
=
1
x
=
−3
(3)
1
:
5
=
−4
:
4
x
4
x
=
5
×
(
−4
)
x
=
−5
(4)
−36
:
3
x
=
−16
:
4
−16
×
3
x
=
−36
×
4
x
=
3
(5)
10
:
x
−
3
=
−5
:
−1
−5
×
(
x
−
3
)
=
10
×
(
−1
)
x
−
3
=
2
x
=
5
(6)
−6
:
−3
=
24
:
−3
x
−6
×
(
−3
)
x
=
−3
×
24
x
=
−4
(7)
4
:
5
=
−2
x
:
−30
5
×
(
−2
)
x
=
4
×
(
−30
)
x
=
12
(8)
2
x
:
−8
=
1
:
4
4
×
2
x
=
−8
x
=
−1
(9)
3
x
:
−27
=
2
:
−3
−3
×
3
x
=
−27
×
2
x
=
6
(10)
x
+
3
:
−3
=
−15
:
−5
−5
×
(
x
+
3
)
=
−3
×
(
−15
)
x
+
3
=
−9
x
=
−12
(11)
−12
:
−4
x
=
−1
:
2
−
(
−4
)
x
=
−12
×
2
x
=
−6
(12)
−2
:
−1
=
x
+
2
:
3
−
(
x
+
2
)
=
−2
×
3
x
+
2
=
6
x
=
4
(13)
−2
:
2
=
−4
x
:
−4
2
×
(
−4
)
x
=
−2
×
(
−4
)
x
=
−1
(14)
−5
:
5
=
−
x
:
1
5
×
(
−1
)
x
=
−5
x
=
1
(15)
−1
:
−2
=
4
x
:
32
−2
×
4
x
=
−
32
x
=
4
(16)
−1
:
−
x
=
3
:
−3
3
×
(
−1
)
x
=
−
(
−3
)
x
=
−1