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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)
x
+
4
:
−4
=
−20
:
4
(2)
−4
x
:
−20
=
−4
:
−1
(3)
−4
:
4
x
=
−3
:
−15
(4)
−15
:
x
−
3
=
5
:
−1
(5)
−4
:
5
=
−4
x
:
−60
(6)
x
+
4
:
2
=
−12
:
8
(7)
x
+
3
:
−5
=
−12
:
4
(8)
−2
:
6
=
x
+
3
:
−9
(9)
3
:
−5
=
15
:
−5
x
(10)
4
:
−4
=
24
:
−3
x
(11)
x
+
4
:
−25
=
1
:
−5
(12)
4
:
−4
=
60
:
−3
x
(13)
−2
:
x
−
3
=
−4
:
6
(14)
24
:
3
x
=
6
:
3
(15)
12
:
−4
=
3
:
x
+
3
(16)
x
+
2
:
−4
=
15
:
12
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
+
4
:
−4
=
−20
:
4
4
×
(
x
+
4
)
=
−4
×
(
−20
)
x
+
4
=
20
x
=
16
(2)
−4
x
:
−20
=
−4
:
−1
−
(
−4
)
x
=
−20
×
(
−4
)
x
=
20
(3)
−4
:
4
x
=
−3
:
−15
−3
×
4
x
=
−4
×
(
−15
)
x
=
−5
(4)
−15
:
x
−
3
=
5
:
−1
5
×
(
x
−
3
)
=
−15
×
(
−1
)
x
−
3
=
3
x
=
6
(5)
−4
:
5
=
−4
x
:
−60
5
×
(
−4
)
x
=
−4
×
(
−60
)
x
=
−12
(6)
x
+
4
:
2
=
−12
:
8
8
×
(
x
+
4
)
=
2
×
(
−12
)
x
+
4
=
−3
x
=
−7
(7)
x
+
3
:
−5
=
−12
:
4
4
×
(
x
+
3
)
=
−5
×
(
−12
)
x
+
3
=
15
x
=
12
(8)
−2
:
6
=
x
+
3
:
−9
6
×
(
x
+
3
)
=
−2
×
(
−9
)
x
+
3
=
3
x
=
0
(9)
3
:
−5
=
15
:
−5
x
3
×
(
−5
)
x
=
−5
×
15
x
=
5
(10)
4
:
−4
=
24
:
−3
x
4
×
(
−3
)
x
=
−4
×
24
x
=
8
(11)
x
+
4
:
−25
=
1
:
−5
−5
×
(
x
+
4
)
=
−25
x
+
4
=
5
x
=
1
(12)
4
:
−4
=
60
:
−3
x
4
×
(
−3
)
x
=
−4
×
60
x
=
20
(13)
−2
:
x
−
3
=
−4
:
6
−4
×
(
x
−
3
)
=
−2
×
6
x
−
3
=
3
x
=
6
(14)
24
:
3
x
=
6
:
3
6
×
3
x
=
24
×
3
x
=
4
(15)
12
:
−4
=
3
:
x
+
3
12
×
(
x
+
3
)
=
−4
×
3
x
+
3
=
−1
x
=
−4
(16)
x
+
2
:
−4
=
15
:
12
12
×
(
x
+
2
)
=
−4
×
15
x
+
2
=
−5
x
=
−7