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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)
−4
:
−2
x
=
−4
:
−2
(2)
−4
:
12
=
9
:
3
x
(3)
16
:
20
=
2
x
:
−10
(4)
−2
:
8
=
−3
x
:
−12
(5)
−3
:
9
=
x
+
4
:
−3
(6)
4
:
x
+
5
=
20
:
−15
(7)
5
x
:
10
=
2
:
1
(8)
1
:
−1
=
4
:
x
+
3
(9)
−4
x
:
−36
=
−2
:
6
(10)
−3
x
:
−36
=
1
:
4
(11)
−20
:
x
−
3
=
−4
:
−5
(12)
−5
:
10
=
−
x
:
6
(13)
−1
:
2
=
8
:
−4
x
(14)
5
x
:
45
=
−5
:
−15
(15)
6
:
−3
x
=
−4
:
2
(16)
−9
:
−6
=
3
:
x
+
2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−4
:
−2
x
=
−4
:
−2
−4
×
(
−2
)
x
=
−4
×
(
−2
)
x
=
1
(2)
−4
:
12
=
9
:
3
x
−4
×
3
x
=
12
×
9
x
=
−9
(3)
16
:
20
=
2
x
:
−10
20
×
2
x
=
16
×
(
−10
)
x
=
−4
(4)
−2
:
8
=
−3
x
:
−12
8
×
(
−3
)
x
=
−2
×
(
−12
)
x
=
−1
(5)
−3
:
9
=
x
+
4
:
−3
9
×
(
x
+
4
)
=
−3
×
(
−3
)
x
+
4
=
1
x
=
−3
(6)
4
:
x
+
5
=
20
:
−15
20
×
(
x
+
5
)
=
4
×
(
−15
)
x
+
5
=
−3
x
=
−8
(7)
5
x
:
10
=
2
:
1
5
x
=
10
×
2
x
=
4
(8)
1
:
−1
=
4
:
x
+
3
x
+
3
=
−
4
x
+
3
=
−4
x
=
−7
(9)
−4
x
:
−36
=
−2
:
6
6
×
(
−4
)
x
=
−36
×
(
−2
)
x
=
−3
(10)
−3
x
:
−36
=
1
:
4
4
×
(
−3
)
x
=
−36
x
=
3
(11)
−20
:
x
−
3
=
−4
:
−5
−4
×
(
x
−
3
)
=
−20
×
(
−5
)
x
−
3
=
−25
x
=
−22
(12)
−5
:
10
=
−
x
:
6
10
×
(
−1
)
x
=
−5
×
6
x
=
3
(13)
−1
:
2
=
8
:
−4
x
−
(
−4
)
x
=
2
×
8
x
=
4
(14)
5
x
:
45
=
−5
:
−15
−15
×
5
x
=
45
×
(
−5
)
x
=
3
(15)
6
:
−3
x
=
−4
:
2
−4
×
(
−3
)
x
=
6
×
2
x
=
1
(16)
−9
:
−6
=
3
:
x
+
2
−9
×
(
x
+
2
)
=
−6
×
3
x
+
2
=
2
x
=
0