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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)
−45
:
−3
x
=
−10
:
−2
(2)
10
:
5
=
8
:
x
−
3
(3)
x
+
3
:
−6
=
−3
:
3
(4)
−3
:
3
=
−8
:
−2
x
(5)
x
−
2
:
4
=
25
:
20
(6)
30
:
−3
x
=
5
:
2
(7)
−5
x
:
5
=
20
:
−5
(8)
24
:
−3
x
=
−10
:
5
(9)
x
−
2
:
4
=
−1
:
−4
(10)
x
−
4
:
−1
=
3
:
−3
(11)
−2
:
−10
=
−
x
:
25
(12)
x
+
2
:
3
=
−20
:
12
(13)
−1
:
x
−
3
=
5
:
20
(14)
10
:
2
=
−5
:
x
+
4
(15)
2
:
1
=
−4
x
:
8
(16)
60
:
−4
x
=
3
:
5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−45
:
−3
x
=
−10
:
−2
−10
×
(
−3
)
x
=
−45
×
(
−2
)
x
=
3
(2)
10
:
5
=
8
:
x
−
3
10
×
(
x
−
3
)
=
5
×
8
x
−
3
=
4
x
=
7
(3)
x
+
3
:
−6
=
−3
:
3
3
×
(
x
+
3
)
=
−6
×
(
−3
)
x
+
3
=
6
x
=
3
(4)
−3
:
3
=
−8
:
−2
x
−3
×
(
−2
)
x
=
3
×
(
−8
)
x
=
−4
(5)
x
−
2
:
4
=
25
:
20
20
×
(
x
−
2
)
=
4
×
25
x
−
2
=
5
x
=
7
(6)
30
:
−3
x
=
5
:
2
5
×
(
−3
)
x
=
30
×
2
x
=
−4
(7)
−5
x
:
5
=
20
:
−5
−5
×
(
−5
)
x
=
5
×
20
x
=
4
(8)
24
:
−3
x
=
−10
:
5
−10
×
(
−3
)
x
=
24
×
5
x
=
4
(9)
x
−
2
:
4
=
−1
:
−4
−4
×
(
x
−
2
)
=
4
×
(
−1
)
x
−
2
=
1
x
=
3
(10)
x
−
4
:
−1
=
3
:
−3
−3
×
(
x
−
4
)
=
−
3
x
−
4
=
1
x
=
5
(11)
−2
:
−10
=
−
x
:
25
−10
×
(
−1
)
x
=
−2
×
25
x
=
−5
(12)
x
+
2
:
3
=
−20
:
12
12
×
(
x
+
2
)
=
3
×
(
−20
)
x
+
2
=
−5
x
=
−7
(13)
−1
:
x
−
3
=
5
:
20
5
×
(
x
−
3
)
=
−
20
x
−
3
=
−4
x
=
−1
(14)
10
:
2
=
−5
:
x
+
4
10
×
(
x
+
4
)
=
2
×
(
−5
)
x
+
4
=
−1
x
=
−5
(15)
2
:
1
=
−4
x
:
8
−4
x
=
2
×
8
x
=
−4
(16)
60
:
−4
x
=
3
:
5
3
×
(
−4
)
x
=
60
×
5
x
=
−25