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