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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)
9
:
3
x
=
1
:
−2
(2)
4
:
x
+
3
=
−1
:
4
(3)
−5
:
−1
=
−25
:
x
−
1
(4)
3
:
−3
=
5
:
x
−
4
(5)
−12
:
x
−
1
=
20
:
5
(6)
−10
:
−2
x
=
3
:
12
(7)
−12
:
4
x
=
−9
:
−6
(8)
9
:
3
=
x
−
2
:
5
(9)
−5
:
2
=
60
:
3
x
(10)
−3
x
:
9
=
4
:
−1
(11)
4
:
x
+
2
=
−2
:
−8
(12)
x
+
2
:
20
=
−5
:
25
(13)
−3
:
6
=
−3
x
:
−24
(14)
−15
:
3
=
−25
:
x
+
5
(15)
1
:
x
−
1
=
2
:
4
(16)
3
:
12
=
3
:
−
x
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
9
:
3
x
=
1
:
−2
3
x
=
9
×
(
−2
)
x
=
−6
(2)
4
:
x
+
3
=
−1
:
4
−
(
x
+
3
)
=
4
×
4
x
+
3
=
−16
x
=
−19
(3)
−5
:
−1
=
−25
:
x
−
1
−5
×
(
x
−
1
)
=
−
(
−25
)
x
−
1
=
−5
x
=
−4
(4)
3
:
−3
=
5
:
x
−
4
3
×
(
x
−
4
)
=
−3
×
5
x
−
4
=
−5
x
=
−1
(5)
−12
:
x
−
1
=
20
:
5
20
×
(
x
−
1
)
=
−12
×
5
x
−
1
=
−3
x
=
−2
(6)
−10
:
−2
x
=
3
:
12
3
×
(
−2
)
x
=
−10
×
12
x
=
20
(7)
−12
:
4
x
=
−9
:
−6
−9
×
4
x
=
−12
×
(
−6
)
x
=
−2
(8)
9
:
3
=
x
−
2
:
5
3
×
(
x
−
2
)
=
9
×
5
x
−
2
=
15
x
=
17
(9)
−5
:
2
=
60
:
3
x
−5
×
3
x
=
2
×
60
x
=
−8
(10)
−3
x
:
9
=
4
:
−1
−
(
−3
)
x
=
9
×
4
x
=
12
(11)
4
:
x
+
2
=
−2
:
−8
−2
×
(
x
+
2
)
=
4
×
(
−8
)
x
+
2
=
16
x
=
14
(12)
x
+
2
:
20
=
−5
:
25
25
×
(
x
+
2
)
=
20
×
(
−5
)
x
+
2
=
−4
x
=
−6
(13)
−3
:
6
=
−3
x
:
−24
6
×
(
−3
)
x
=
−3
×
(
−24
)
x
=
−4
(14)
−15
:
3
=
−25
:
x
+
5
−15
×
(
x
+
5
)
=
3
×
(
−25
)
x
+
5
=
5
x
=
0
(15)
1
:
x
−
1
=
2
:
4
2
×
(
x
−
1
)
=
4
x
−
1
=
2
x
=
3
(16)
3
:
12
=
3
:
−
x
3
×
(
−1
)
x
=
12
×
3
x
=
−12