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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)
2
:
6
=
−12
:
−4
x
(2)
30
:
−2
x
=
−3
:
3
(3)
x
−
2
:
25
=
3
:
15
(4)
−3
:
1
=
2
x
:
−8
(5)
32
:
−2
x
=
20
:
−5
(6)
1
:
5
=
−1
:
x
+
3
(7)
−36
:
4
x
=
−3
:
3
(8)
−5
:
x
−
4
=
−10
:
4
(9)
−3
x
:
60
=
−1
:
4
(10)
3
:
15
=
5
x
:
−100
(11)
−3
:
1
=
−48
:
4
x
(12)
−1
:
5
=
x
−
4
:
10
(13)
−3
:
2
=
48
:
4
x
(14)
−4
:
1
=
x
−
3
:
−1
(15)
10
:
−4
=
−2
x
:
−4
(16)
−3
:
2
=
−27
:
−3
x
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
:
6
=
−12
:
−4
x
2
×
(
−4
)
x
=
6
×
(
−12
)
x
=
9
(2)
30
:
−2
x
=
−3
:
3
−3
×
(
−2
)
x
=
30
×
3
x
=
15
(3)
x
−
2
:
25
=
3
:
15
15
×
(
x
−
2
)
=
25
×
3
x
−
2
=
5
x
=
7
(4)
−3
:
1
=
2
x
:
−8
2
x
=
−3
×
(
−8
)
x
=
12
(5)
32
:
−2
x
=
20
:
−5
20
×
(
−2
)
x
=
32
×
(
−5
)
x
=
4
(6)
1
:
5
=
−1
:
x
+
3
x
+
3
=
5
×
(
−1
)
x
+
3
=
−5
x
=
−8
(7)
−36
:
4
x
=
−3
:
3
−3
×
4
x
=
−36
×
3
x
=
9
(8)
−5
:
x
−
4
=
−10
:
4
−10
×
(
x
−
4
)
=
−5
×
4
x
−
4
=
2
x
=
6
(9)
−3
x
:
60
=
−1
:
4
4
×
(
−3
)
x
=
60
×
(
−1
)
x
=
5
(10)
3
:
15
=
5
x
:
−100
15
×
5
x
=
3
×
(
−100
)
x
=
−4
(11)
−3
:
1
=
−48
:
4
x
−3
×
4
x
=
−48
x
=
4
(12)
−1
:
5
=
x
−
4
:
10
5
×
(
x
−
4
)
=
−
10
x
−
4
=
−2
x
=
2
(13)
−3
:
2
=
48
:
4
x
−3
×
4
x
=
2
×
48
x
=
−8
(14)
−4
:
1
=
x
−
3
:
−1
x
−
3
=
−4
×
(
−1
)
x
−
3
=
4
x
=
7
(15)
10
:
−4
=
−2
x
:
−4
−4
×
(
−2
)
x
=
10
×
(
−4
)
x
=
−5
(16)
−3
:
2
=
−27
:
−3
x
−3
×
(
−3
)
x
=
2
×
(
−27
)
x
=
−6