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