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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
+
5
=
−5
:
20
(2)
3
x
:
−9
=
−15
:
3
(3)
2
x
:
4
=
15
:
−10
(4)
−5
:
−1
=
−10
:
−2
x
(5)
2
:
8
=
−5
x
:
−20
(6)
−5
:
−1
=
x
+
4
:
3
(7)
2
:
−1
=
x
+
3
:
4
(8)
15
:
x
−
5
=
10
:
2
(9)
−2
:
−4
=
−
x
:
−2
(10)
x
+
3
:
−10
=
−1
:
−5
(11)
3
x
:
−36
=
4
:
−3
(12)
1
:
3
=
−1
:
x
−
1
(13)
−4
x
:
8
=
−4
:
2
(14)
−6
:
2
=
45
:
3
x
(15)
3
:
x
+
5
=
−3
:
−2
(16)
−6
:
−2
=
x
+
5
:
−1
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−4
:
x
+
5
=
−5
:
20
−5
×
(
x
+
5
)
=
−4
×
20
x
+
5
=
16
x
=
11
(2)
3
x
:
−9
=
−15
:
3
3
×
3
x
=
−9
×
(
−15
)
x
=
15
(3)
2
x
:
4
=
15
:
−10
−10
×
2
x
=
4
×
15
x
=
−3
(4)
−5
:
−1
=
−10
:
−2
x
−5
×
(
−2
)
x
=
−
(
−10
)
x
=
1
(5)
2
:
8
=
−5
x
:
−20
8
×
(
−5
)
x
=
2
×
(
−20
)
x
=
1
(6)
−5
:
−1
=
x
+
4
:
3
−
(
x
+
4
)
=
−5
×
3
x
+
4
=
15
x
=
11
(7)
2
:
−1
=
x
+
3
:
4
−
(
x
+
3
)
=
2
×
4
x
+
3
=
−8
x
=
−11
(8)
15
:
x
−
5
=
10
:
2
10
×
(
x
−
5
)
=
15
×
2
x
−
5
=
3
x
=
8
(9)
−2
:
−4
=
−
x
:
−2
−4
×
(
−1
)
x
=
−2
×
(
−2
)
x
=
1
(10)
x
+
3
:
−10
=
−1
:
−5
−5
×
(
x
+
3
)
=
−10
×
(
−1
)
x
+
3
=
−2
x
=
−5
(11)
3
x
:
−36
=
4
:
−3
−3
×
3
x
=
−36
×
4
x
=
16
(12)
1
:
3
=
−1
:
x
−
1
x
−
1
=
3
×
(
−1
)
x
−
1
=
−3
x
=
−2
(13)
−4
x
:
8
=
−4
:
2
2
×
(
−4
)
x
=
8
×
(
−4
)
x
=
4
(14)
−6
:
2
=
45
:
3
x
−6
×
3
x
=
2
×
45
x
=
−5
(15)
3
:
x
+
5
=
−3
:
−2
−3
×
(
x
+
5
)
=
3
×
(
−2
)
x
+
5
=
2
x
=
−3
(16)
−6
:
−2
=
x
+
5
:
−1
−2
×
(
x
+
5
)
=
−6
×
(
−1
)
x
+
5
=
−3
x
=
−8