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©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の比例式を解きなさい
[0G1-00]
(1)
1
:
5
=
−1
:
x
+
5
(2)
36
:
−4
x
=
3
:
−4
(3)
20
:
x
+
2
=
−25
:
−5
(4)
16
:
−4
x
=
2
:
1
(5)
15
:
−15
=
15
:
−3
x
(6)
−5
:
3
=
−5
x
:
45
(7)
−2
:
x
+
2
=
−4
:
−8
(8)
−2
:
−4
=
x
−
5
:
10
(9)
x
−
5
:
−10
=
−2
:
−4
(10)
−3
x
:
24
=
−1
:
−4
(11)
60
:
−5
x
=
4
:
3
(12)
x
+
3
:
16
=
3
:
−12
(13)
−20
:
5
=
−5
x
:
−15
(14)
12
:
−4
=
−2
x
:
4
(15)
3
:
4
=
−45
:
−3
x
(16)
x
−
3
:
10
=
−1
:
−5
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
1
:
5
=
−1
:
x
+
5
x
+
5
=
5
×
(
−1
)
x
+
5
=
−5
x
=
−10
(2)
36
:
−4
x
=
3
:
−4
3
×
(
−4
)
x
=
36
×
(
−4
)
x
=
12
(3)
20
:
x
+
2
=
−25
:
−5
−25
×
(
x
+
2
)
=
20
×
(
−5
)
x
+
2
=
4
x
=
2
(4)
16
:
−4
x
=
2
:
1
2
×
(
−4
)
x
=
16
x
=
−2
(5)
15
:
−15
=
15
:
−3
x
15
×
(
−3
)
x
=
−15
×
15
x
=
5
(6)
−5
:
3
=
−5
x
:
45
3
×
(
−5
)
x
=
−5
×
45
x
=
15
(7)
−2
:
x
+
2
=
−4
:
−8
−4
×
(
x
+
2
)
=
−2
×
(
−8
)
x
+
2
=
−4
x
=
−6
(8)
−2
:
−4
=
x
−
5
:
10
−4
×
(
x
−
5
)
=
−2
×
10
x
−
5
=
5
x
=
10
(9)
x
−
5
:
−10
=
−2
:
−4
−4
×
(
x
−
5
)
=
−10
×
(
−2
)
x
−
5
=
−5
x
=
0
(10)
−3
x
:
24
=
−1
:
−4
−4
×
(
−3
)
x
=
24
×
(
−1
)
x
=
−2
(11)
60
:
−5
x
=
4
:
3
4
×
(
−5
)
x
=
60
×
3
x
=
−9
(12)
x
+
3
:
16
=
3
:
−12
−12
×
(
x
+
3
)
=
16
×
3
x
+
3
=
−4
x
=
−7
(13)
−20
:
5
=
−5
x
:
−15
5
×
(
−5
)
x
=
−20
×
(
−15
)
x
=
−12
(14)
12
:
−4
=
−2
x
:
4
−4
×
(
−2
)
x
=
12
×
4
x
=
6
(15)
3
:
4
=
−45
:
−3
x
3
×
(
−3
)
x
=
4
×
(
−45
)
x
=
20
(16)
x
−
3
:
10
=
−1
:
−5
−5
×
(
x
−
3
)
=
10
×
(
−1
)
x
−
3
=
2
x
=
5