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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
x
:
16
=
−12
:
−16
(2)
−8
:
12
=
x
−
5
:
−3
(3)
20
:
−5
=
−8
:
x
+
3
(4)
−3
:
x
+
4
=
−1
:
−3
(5)
x
+
2
:
−10
=
−5
:
5
(6)
−3
:
1
=
2
x
:
−4
(7)
−25
:
5
=
x
+
3
:
−1
(8)
3
:
9
=
−4
x
:
48
(9)
40
:
4
x
=
8
:
4
(10)
4
:
−
x
=
4
:
1
(11)
2
x
:
2
=
4
:
2
(12)
−20
:
4
x
=
3
:
−3
(13)
−5
:
5
=
2
x
:
2
(14)
−1
:
1
=
x
−
4
:
2
(15)
−5
:
4
=
−15
:
−3
x
(16)
20
:
4
x
=
1
:
5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−4
x
:
16
=
−12
:
−16
−16
×
(
−4
)
x
=
16
×
(
−12
)
x
=
−3
(2)
−8
:
12
=
x
−
5
:
−3
12
×
(
x
−
5
)
=
−8
×
(
−3
)
x
−
5
=
2
x
=
7
(3)
20
:
−5
=
−8
:
x
+
3
20
×
(
x
+
3
)
=
−5
×
(
−8
)
x
+
3
=
2
x
=
−1
(4)
−3
:
x
+
4
=
−1
:
−3
−
(
x
+
4
)
=
−3
×
(
−3
)
x
+
4
=
−9
x
=
−13
(5)
x
+
2
:
−10
=
−5
:
5
5
×
(
x
+
2
)
=
−10
×
(
−5
)
x
+
2
=
10
x
=
8
(6)
−3
:
1
=
2
x
:
−4
2
x
=
−3
×
(
−4
)
x
=
6
(7)
−25
:
5
=
x
+
3
:
−1
5
×
(
x
+
3
)
=
−25
×
(
−1
)
x
+
3
=
5
x
=
2
(8)
3
:
9
=
−4
x
:
48
9
×
(
−4
)
x
=
3
×
48
x
=
−4
(9)
40
:
4
x
=
8
:
4
8
×
4
x
=
40
×
4
x
=
5
(10)
4
:
−
x
=
4
:
1
4
×
(
−1
)
x
=
4
x
=
−1
(11)
2
x
:
2
=
4
:
2
2
×
2
x
=
2
×
4
x
=
2
(12)
−20
:
4
x
=
3
:
−3
3
×
4
x
=
−20
×
(
−3
)
x
=
5
(13)
−5
:
5
=
2
x
:
2
5
×
2
x
=
−5
×
2
x
=
−1
(14)
−1
:
1
=
x
−
4
:
2
x
−
4
=
−
2
x
−
4
=
−2
x
=
2
(15)
−5
:
4
=
−15
:
−3
x
−5
×
(
−3
)
x
=
4
×
(
−15
)
x
=
−4
(16)
20
:
4
x
=
1
:
5
4
x
=
20
×
5
x
=
25