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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)
3
:
x
+
4
=
−1
:
4
(2)
5
x
:
−25
=
−4
:
4
(3)
−3
x
:
9
=
4
:
12
(4)
20
:
−5
=
−2
x
:
6
(5)
10
:
−4
=
25
:
−5
x
(6)
−4
x
:
−16
=
5
:
−20
(7)
5
:
−25
=
x
+
4
:
20
(8)
−5
:
−4
=
4
x
:
−48
(9)
−4
:
−
x
=
20
:
15
(10)
−5
x
:
−60
=
1
:
4
(11)
−1
:
−5
=
−2
x
:
−40
(12)
−3
:
−
x
=
−3
:
3
(13)
3
:
−2
=
−6
:
2
x
(14)
4
:
1
=
−16
:
x
−
1
(15)
4
:
−4
=
5
:
x
−
3
(16)
−5
:
20
=
x
+
4
:
−4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
3
:
x
+
4
=
−1
:
4
−
(
x
+
4
)
=
3
×
4
x
+
4
=
−12
x
=
−16
(2)
5
x
:
−25
=
−4
:
4
4
×
5
x
=
−25
×
(
−4
)
x
=
5
(3)
−3
x
:
9
=
4
:
12
12
×
(
−3
)
x
=
9
×
4
x
=
−1
(4)
20
:
−5
=
−2
x
:
6
−5
×
(
−2
)
x
=
20
×
6
x
=
12
(5)
10
:
−4
=
25
:
−5
x
10
×
(
−5
)
x
=
−4
×
25
x
=
2
(6)
−4
x
:
−16
=
5
:
−20
−20
×
(
−4
)
x
=
−16
×
5
x
=
−1
(7)
5
:
−25
=
x
+
4
:
20
−25
×
(
x
+
4
)
=
5
×
20
x
+
4
=
−4
x
=
−8
(8)
−5
:
−4
=
4
x
:
−48
−4
×
4
x
=
−5
×
(
−48
)
x
=
−15
(9)
−4
:
−
x
=
20
:
15
20
×
(
−1
)
x
=
−4
×
15
x
=
3
(10)
−5
x
:
−60
=
1
:
4
4
×
(
−5
)
x
=
−60
x
=
3
(11)
−1
:
−5
=
−2
x
:
−40
−5
×
(
−2
)
x
=
−
(
−40
)
x
=
4
(12)
−3
:
−
x
=
−3
:
3
−3
×
(
−1
)
x
=
−3
×
3
x
=
−3
(13)
3
:
−2
=
−6
:
2
x
3
×
2
x
=
−2
×
(
−6
)
x
=
2
(14)
4
:
1
=
−16
:
x
−
1
4
×
(
x
−
1
)
=
−16
x
−
1
=
−4
x
=
−3
(15)
4
:
−4
=
5
:
x
−
3
4
×
(
x
−
3
)
=
−4
×
5
x
−
3
=
−5
x
=
−2
(16)
−5
:
20
=
x
+
4
:
−4
20
×
(
x
+
4
)
=
−5
×
(
−4
)
x
+
4
=
1
x
=
−3