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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)
5
:
−1
=
45
:
3
x
(2)
−1
:
5
=
x
−
1
:
15
(3)
1
:
−1
=
−2
:
x
+
2
(4)
16
:
−12
=
x
+
3
:
−3
(5)
−2
x
:
24
=
−2
:
−8
(6)
−15
:
x
+
3
=
6
:
2
(7)
−5
:
−3
=
x
+
5
:
15
(8)
−3
:
2
=
−15
:
−
x
(9)
−
x
:
−3
=
5
:
−15
(10)
−5
:
−2
=
x
−
5
:
−8
(11)
15
:
−9
=
x
+
3
:
−3
(12)
8
:
−2
=
40
:
2
x
(13)
4
:
3
=
x
+
4
:
−6
(14)
−5
:
x
−
4
=
−10
:
6
(15)
6
:
−6
=
−
x
:
−3
(16)
−10
:
5
x
=
10
:
20
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
5
:
−1
=
45
:
3
x
5
×
3
x
=
−
45
x
=
−3
(2)
−1
:
5
=
x
−
1
:
15
5
×
(
x
−
1
)
=
−
15
x
−
1
=
−3
x
=
−2
(3)
1
:
−1
=
−2
:
x
+
2
x
+
2
=
−
(
−2
)
x
+
2
=
2
x
=
0
(4)
16
:
−12
=
x
+
3
:
−3
−12
×
(
x
+
3
)
=
16
×
(
−3
)
x
+
3
=
4
x
=
1
(5)
−2
x
:
24
=
−2
:
−8
−8
×
(
−2
)
x
=
24
×
(
−2
)
x
=
−3
(6)
−15
:
x
+
3
=
6
:
2
6
×
(
x
+
3
)
=
−15
×
2
x
+
3
=
−5
x
=
−8
(7)
−5
:
−3
=
x
+
5
:
15
−3
×
(
x
+
5
)
=
−5
×
15
x
+
5
=
25
x
=
20
(8)
−3
:
2
=
−15
:
−
x
−3
×
(
−1
)
x
=
2
×
(
−15
)
x
=
−10
(9)
−
x
:
−3
=
5
:
−15
−15
×
(
−1
)
x
=
−3
×
5
x
=
−1
(10)
−5
:
−2
=
x
−
5
:
−8
−2
×
(
x
−
5
)
=
−5
×
(
−8
)
x
−
5
=
−20
x
=
−15
(11)
15
:
−9
=
x
+
3
:
−3
−9
×
(
x
+
3
)
=
15
×
(
−3
)
x
+
3
=
5
x
=
2
(12)
8
:
−2
=
40
:
2
x
8
×
2
x
=
−2
×
40
x
=
−5
(13)
4
:
3
=
x
+
4
:
−6
3
×
(
x
+
4
)
=
4
×
(
−6
)
x
+
4
=
−8
x
=
−12
(14)
−5
:
x
−
4
=
−10
:
6
−10
×
(
x
−
4
)
=
−5
×
6
x
−
4
=
3
x
=
7
(15)
6
:
−6
=
−
x
:
−3
−6
×
(
−1
)
x
=
6
×
(
−3
)
x
=
−3
(16)
−10
:
5
x
=
10
:
20
10
×
5
x
=
−10
×
20
x
=
−4