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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)
5
:
−5
=
−4
:
x
+
2
(2)
−2
:
2
=
4
x
:
−4
(3)
20
:
x
−
3
=
−5
:
−1
(4)
8
:
4
=
−16
:
4
x
(5)
−4
:
2
=
−2
:
x
+
4
(6)
−16
:
4
=
−3
x
:
−9
(7)
8
:
4
x
=
1
:
2
(8)
3
:
6
=
x
−
4
:
2
(9)
4
x
:
16
=
3
:
2
(10)
−24
:
−4
x
=
3
:
−4
(11)
2
:
x
+
4
=
−5
:
5
(12)
−5
x
:
−75
=
4
:
−5
(13)
25
:
−5
=
−25
:
−5
x
(14)
2
:
−2
=
−3
x
:
9
(15)
−20
:
5
=
−16
:
x
−
3
(16)
−16
:
−4
=
−2
x
:
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
5
:
−5
=
−4
:
x
+
2
5
×
(
x
+
2
)
=
−5
×
(
−4
)
x
+
2
=
4
x
=
2
(2)
−2
:
2
=
4
x
:
−4
2
×
4
x
=
−2
×
(
−4
)
x
=
1
(3)
20
:
x
−
3
=
−5
:
−1
−5
×
(
x
−
3
)
=
20
×
(
−1
)
x
−
3
=
4
x
=
7
(4)
8
:
4
=
−16
:
4
x
8
×
4
x
=
4
×
(
−16
)
x
=
−2
(5)
−4
:
2
=
−2
:
x
+
4
−4
×
(
x
+
4
)
=
2
×
(
−2
)
x
+
4
=
1
x
=
−3
(6)
−16
:
4
=
−3
x
:
−9
4
×
(
−3
)
x
=
−16
×
(
−9
)
x
=
−12
(7)
8
:
4
x
=
1
:
2
4
x
=
8
×
2
x
=
4
(8)
3
:
6
=
x
−
4
:
2
6
×
(
x
−
4
)
=
3
×
2
x
−
4
=
1
x
=
5
(9)
4
x
:
16
=
3
:
2
2
×
4
x
=
16
×
3
x
=
6
(10)
−24
:
−4
x
=
3
:
−4
3
×
(
−4
)
x
=
−24
×
(
−4
)
x
=
−8
(11)
2
:
x
+
4
=
−5
:
5
−5
×
(
x
+
4
)
=
2
×
5
x
+
4
=
−2
x
=
−6
(12)
−5
x
:
−75
=
4
:
−5
−5
×
(
−5
)
x
=
−75
×
4
x
=
−12
(13)
25
:
−5
=
−25
:
−5
x
25
×
(
−5
)
x
=
−5
×
(
−25
)
x
=
−1
(14)
2
:
−2
=
−3
x
:
9
−2
×
(
−3
)
x
=
2
×
9
x
=
3
(15)
−20
:
5
=
−16
:
x
−
3
−20
×
(
x
−
3
)
=
5
×
(
−16
)
x
−
3
=
4
x
=
7
(16)
−16
:
−4
=
−2
x
:
4
−4
×
(
−2
)
x
=
−16
×
4
x
=
−8