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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)
15
:
10
=
x
−
3
:
−2
(2)
4
:
−2
=
5
x
:
−50
(3)
9
:
−3
=
−24
:
4
x
(4)
−1
:
3
=
2
x
:
−18
(5)
−20
:
8
=
x
−
1
:
−2
(6)
−5
x
:
5
=
−25
:
−5
(7)
3
:
9
=
3
:
3
x
(8)
3
:
−12
=
−25
:
−5
x
(9)
−4
:
3
=
−2
x
:
−18
(10)
15
:
25
=
−3
x
:
15
(11)
−2
:
x
+
2
=
−1
:
1
(12)
−10
:
−2
x
=
−15
:
−9
(13)
−3
:
5
=
−9
:
−
x
(14)
−
x
:
−6
=
3
:
9
(15)
15
:
3
x
=
−4
:
20
(16)
−5
:
5
=
x
+
2
:
3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
15
:
10
=
x
−
3
:
−2
10
×
(
x
−
3
)
=
15
×
(
−2
)
x
−
3
=
−3
x
=
0
(2)
4
:
−2
=
5
x
:
−50
−2
×
5
x
=
4
×
(
−50
)
x
=
20
(3)
9
:
−3
=
−24
:
4
x
9
×
4
x
=
−3
×
(
−24
)
x
=
2
(4)
−1
:
3
=
2
x
:
−18
3
×
2
x
=
−
(
−18
)
x
=
3
(5)
−20
:
8
=
x
−
1
:
−2
8
×
(
x
−
1
)
=
−20
×
(
−2
)
x
−
1
=
5
x
=
6
(6)
−5
x
:
5
=
−25
:
−5
−5
×
(
−5
)
x
=
5
×
(
−25
)
x
=
−5
(7)
3
:
9
=
3
:
3
x
3
×
3
x
=
9
×
3
x
=
3
(8)
3
:
−12
=
−25
:
−5
x
3
×
(
−5
)
x
=
−12
×
(
−25
)
x
=
−20
(9)
−4
:
3
=
−2
x
:
−18
3
×
(
−2
)
x
=
−4
×
(
−18
)
x
=
−12
(10)
15
:
25
=
−3
x
:
15
25
×
(
−3
)
x
=
15
×
15
x
=
−3
(11)
−2
:
x
+
2
=
−1
:
1
−
(
x
+
2
)
=
−2
x
+
2
=
2
x
=
0
(12)
−10
:
−2
x
=
−15
:
−9
−15
×
(
−2
)
x
=
−10
×
(
−9
)
x
=
3
(13)
−3
:
5
=
−9
:
−
x
−3
×
(
−1
)
x
=
5
×
(
−9
)
x
=
−15
(14)
−
x
:
−6
=
3
:
9
9
×
(
−1
)
x
=
−6
×
3
x
=
2
(15)
15
:
3
x
=
−4
:
20
−4
×
3
x
=
15
×
20
x
=
−25
(16)
−5
:
5
=
x
+
2
:
3
5
×
(
x
+
2
)
=
−5
×
3
x
+
2
=
−3
x
=
−5