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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)
x
−
3
:
−1
=
3
:
−3
(2)
2
x
:
−8
=
12
:
16
(3)
3
:
x
+
2
=
−3
:
−12
(4)
−2
:
−1
=
5
x
:
20
(5)
−12
:
−3
x
=
−3
:
3
(6)
4
:
−4
=
−2
x
:
6
(7)
2
:
10
=
−2
:
x
−
5
(8)
−15
:
x
+
2
=
12
:
4
(9)
4
:
3
=
48
:
−4
x
(10)
−3
x
:
−45
=
−5
:
3
(11)
4
:
−4
=
x
+
2
:
3
(12)
−5
:
−2
=
50
:
5
x
(13)
15
:
5
x
=
−1
:
3
(14)
x
−
5
:
−2
=
6
:
−3
(15)
−4
:
4
x
=
1
:
−5
(16)
4
:
3
=
−
x
:
6
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
−
3
:
−1
=
3
:
−3
−3
×
(
x
−
3
)
=
−
3
x
−
3
=
1
x
=
4
(2)
2
x
:
−8
=
12
:
16
16
×
2
x
=
−8
×
12
x
=
−3
(3)
3
:
x
+
2
=
−3
:
−12
−3
×
(
x
+
2
)
=
3
×
(
−12
)
x
+
2
=
12
x
=
10
(4)
−2
:
−1
=
5
x
:
20
−
5
x
=
−2
×
20
x
=
8
(5)
−12
:
−3
x
=
−3
:
3
−3
×
(
−3
)
x
=
−12
×
3
x
=
−4
(6)
4
:
−4
=
−2
x
:
6
−4
×
(
−2
)
x
=
4
×
6
x
=
3
(7)
2
:
10
=
−2
:
x
−
5
2
×
(
x
−
5
)
=
10
×
(
−2
)
x
−
5
=
−10
x
=
−5
(8)
−15
:
x
+
2
=
12
:
4
12
×
(
x
+
2
)
=
−15
×
4
x
+
2
=
−5
x
=
−7
(9)
4
:
3
=
48
:
−4
x
4
×
(
−4
)
x
=
3
×
48
x
=
−9
(10)
−3
x
:
−45
=
−5
:
3
3
×
(
−3
)
x
=
−45
×
(
−5
)
x
=
−25
(11)
4
:
−4
=
x
+
2
:
3
−4
×
(
x
+
2
)
=
4
×
3
x
+
2
=
−3
x
=
−5
(12)
−5
:
−2
=
50
:
5
x
−5
×
5
x
=
−2
×
50
x
=
4
(13)
15
:
5
x
=
−1
:
3
−
5
x
=
15
×
3
x
=
−9
(14)
x
−
5
:
−2
=
6
:
−3
−3
×
(
x
−
5
)
=
−2
×
6
x
−
5
=
4
x
=
9
(15)
−4
:
4
x
=
1
:
−5
4
x
=
−4
×
(
−5
)
x
=
5
(16)
4
:
3
=
−
x
:
6
3
×
(
−1
)
x
=
4
×
6
x
=
−8