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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)
x
+
3
:
−8
=
5
:
20
(2)
4
:
8
=
5
:
x
+
2
(3)
x
+
3
:
−1
=
−6
:
3
(4)
−5
:
1
=
25
:
x
−
1
(5)
5
:
−25
=
x
−
4
:
10
(6)
10
:
−2
x
=
20
:
4
(7)
−2
x
:
−24
=
−4
:
−12
(8)
10
:
−5
x
=
2
:
1
(9)
−3
:
1
=
30
:
−5
x
(10)
−20
:
5
=
x
+
3
:
−3
(11)
3
:
5
=
x
−
2
:
−25
(12)
−10
:
2
=
x
−
3
:
−5
(13)
3
:
x
−
4
=
−4
:
−12
(14)
x
+
5
:
4
=
−25
:
5
(15)
−12
:
−4
x
=
15
:
−10
(16)
−5
:
−5
x
=
2
:
4
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
+
3
:
−8
=
5
:
20
20
×
(
x
+
3
)
=
−8
×
5
x
+
3
=
−2
x
=
−5
(2)
4
:
8
=
5
:
x
+
2
4
×
(
x
+
2
)
=
8
×
5
x
+
2
=
10
x
=
8
(3)
x
+
3
:
−1
=
−6
:
3
3
×
(
x
+
3
)
=
−
(
−6
)
x
+
3
=
2
x
=
−1
(4)
−5
:
1
=
25
:
x
−
1
−5
×
(
x
−
1
)
=
25
x
−
1
=
−5
x
=
−4
(5)
5
:
−25
=
x
−
4
:
10
−25
×
(
x
−
4
)
=
5
×
10
x
−
4
=
−2
x
=
2
(6)
10
:
−2
x
=
20
:
4
20
×
(
−2
)
x
=
10
×
4
x
=
−1
(7)
−2
x
:
−24
=
−4
:
−12
−12
×
(
−2
)
x
=
−24
×
(
−4
)
x
=
4
(8)
10
:
−5
x
=
2
:
1
2
×
(
−5
)
x
=
10
x
=
−1
(9)
−3
:
1
=
30
:
−5
x
−3
×
(
−5
)
x
=
30
x
=
2
(10)
−20
:
5
=
x
+
3
:
−3
5
×
(
x
+
3
)
=
−20
×
(
−3
)
x
+
3
=
12
x
=
9
(11)
3
:
5
=
x
−
2
:
−25
5
×
(
x
−
2
)
=
3
×
(
−25
)
x
−
2
=
−15
x
=
−13
(12)
−10
:
2
=
x
−
3
:
−5
2
×
(
x
−
3
)
=
−10
×
(
−5
)
x
−
3
=
25
x
=
28
(13)
3
:
x
−
4
=
−4
:
−12
−4
×
(
x
−
4
)
=
3
×
(
−12
)
x
−
4
=
9
x
=
13
(14)
x
+
5
:
4
=
−25
:
5
5
×
(
x
+
5
)
=
4
×
(
−25
)
x
+
5
=
−20
x
=
−25
(15)
−12
:
−4
x
=
15
:
−10
15
×
(
−4
)
x
=
−12
×
(
−10
)
x
=
−2
(16)
−5
:
−5
x
=
2
:
4
2
×
(
−5
)
x
=
−5
×
4
x
=
2