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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)
3
:
−3
=
12
:
x
+
5
(2)
x
+
2
:
4
=
−1
:
−4
(3)
4
:
2
=
−2
:
x
−
5
(4)
5
:
−5
=
−
x
:
20
(5)
5
:
−20
=
x
+
5
:
4
(6)
−6
:
15
=
8
:
−4
x
(7)
6
:
−4
=
−3
x
:
−6
(8)
−5
:
x
−
5
=
1
:
2
(9)
3
x
:
−60
=
3
:
−12
(10)
x
+
3
:
−1
=
−15
:
3
(11)
25
:
20
=
5
x
:
−20
(12)
4
:
1
=
−4
:
x
−
2
(13)
−8
:
−2
=
−12
:
x
−
5
(14)
1
:
−1
=
3
:
x
−
5
(15)
−2
:
4
=
6
:
3
x
(16)
−4
:
−1
=
36
:
−3
x
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
3
:
−3
=
12
:
x
+
5
3
×
(
x
+
5
)
=
−3
×
12
x
+
5
=
−12
x
=
−17
(2)
x
+
2
:
4
=
−1
:
−4
−4
×
(
x
+
2
)
=
4
×
(
−1
)
x
+
2
=
1
x
=
−1
(3)
4
:
2
=
−2
:
x
−
5
4
×
(
x
−
5
)
=
2
×
(
−2
)
x
−
5
=
−1
x
=
4
(4)
5
:
−5
=
−
x
:
20
−5
×
(
−1
)
x
=
5
×
20
x
=
20
(5)
5
:
−20
=
x
+
5
:
4
−20
×
(
x
+
5
)
=
5
×
4
x
+
5
=
−1
x
=
−6
(6)
−6
:
15
=
8
:
−4
x
−6
×
(
−4
)
x
=
15
×
8
x
=
5
(7)
6
:
−4
=
−3
x
:
−6
−4
×
(
−3
)
x
=
6
×
(
−6
)
x
=
−3
(8)
−5
:
x
−
5
=
1
:
2
x
−
5
=
−5
×
2
x
−
5
=
−10
x
=
−5
(9)
3
x
:
−60
=
3
:
−12
−12
×
3
x
=
−60
×
3
x
=
5
(10)
x
+
3
:
−1
=
−15
:
3
3
×
(
x
+
3
)
=
−
(
−15
)
x
+
3
=
5
x
=
2
(11)
25
:
20
=
5
x
:
−20
20
×
5
x
=
25
×
(
−20
)
x
=
−5
(12)
4
:
1
=
−4
:
x
−
2
4
×
(
x
−
2
)
=
−4
x
−
2
=
−1
x
=
1
(13)
−8
:
−2
=
−12
:
x
−
5
−8
×
(
x
−
5
)
=
−2
×
(
−12
)
x
−
5
=
−3
x
=
2
(14)
1
:
−1
=
3
:
x
−
5
x
−
5
=
−
3
x
−
5
=
−3
x
=
2
(15)
−2
:
4
=
6
:
3
x
−2
×
3
x
=
4
×
6
x
=
−4
(16)
−4
:
−1
=
36
:
−3
x
−4
×
(
−3
)
x
=
−
36
x
=
−3