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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
=
16
:
−4
(2)
5
:
3
=
−15
:
x
+
2
(3)
4
:
−4
=
−5
x
:
−5
(4)
25
:
15
=
5
:
x
−
3
(5)
2
:
−2
=
−2
x
:
−8
(6)
−3
x
:
9
=
−4
:
−12
(7)
4
x
:
−24
=
5
:
−3
(8)
−2
:
2
=
−1
:
x
−
5
(9)
x
−
4
:
5
=
2
:
−2
(10)
2
:
4
=
−1
:
x
+
5
(11)
3
:
−2
=
−4
x
:
−8
(12)
4
:
−4
=
12
:
−4
x
(13)
4
:
−1
=
−5
x
:
20
(14)
2
:
1
=
−20
:
−5
x
(15)
x
+
5
:
12
=
−5
:
3
(16)
2
:
4
=
x
+
2
:
−6
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−16
:
4
x
=
16
:
−4
16
×
4
x
=
−16
×
(
−4
)
x
=
1
(2)
5
:
3
=
−15
:
x
+
2
5
×
(
x
+
2
)
=
3
×
(
−15
)
x
+
2
=
−9
x
=
−11
(3)
4
:
−4
=
−5
x
:
−5
−4
×
(
−5
)
x
=
4
×
(
−5
)
x
=
−1
(4)
25
:
15
=
5
:
x
−
3
25
×
(
x
−
3
)
=
15
×
5
x
−
3
=
3
x
=
6
(5)
2
:
−2
=
−2
x
:
−8
−2
×
(
−2
)
x
=
2
×
(
−8
)
x
=
−4
(6)
−3
x
:
9
=
−4
:
−12
−12
×
(
−3
)
x
=
9
×
(
−4
)
x
=
−1
(7)
4
x
:
−24
=
5
:
−3
−3
×
4
x
=
−24
×
5
x
=
10
(8)
−2
:
2
=
−1
:
x
−
5
−2
×
(
x
−
5
)
=
2
×
(
−1
)
x
−
5
=
1
x
=
6
(9)
x
−
4
:
5
=
2
:
−2
−2
×
(
x
−
4
)
=
5
×
2
x
−
4
=
−5
x
=
−1
(10)
2
:
4
=
−1
:
x
+
5
2
×
(
x
+
5
)
=
4
×
(
−1
)
x
+
5
=
−2
x
=
−7
(11)
3
:
−2
=
−4
x
:
−8
−2
×
(
−4
)
x
=
3
×
(
−8
)
x
=
−3
(12)
4
:
−4
=
12
:
−4
x
4
×
(
−4
)
x
=
−4
×
12
x
=
3
(13)
4
:
−1
=
−5
x
:
20
−
(
−5
)
x
=
4
×
20
x
=
16
(14)
2
:
1
=
−20
:
−5
x
2
×
(
−5
)
x
=
−20
x
=
2
(15)
x
+
5
:
12
=
−5
:
3
3
×
(
x
+
5
)
=
12
×
(
−5
)
x
+
5
=
−20
x
=
−25
(16)
2
:
4
=
x
+
2
:
−6
4
×
(
x
+
2
)
=
2
×
(
−6
)
x
+
2
=
−3
x
=
−5