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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
:
−
x
=
−10
:
−8
(2)
x
−
5
:
3
=
8
:
6
(3)
−5
:
3
=
x
−
3
:
−15
(4)
x
−
5
:
−5
=
−4
:
−20
(5)
−5
:
15
=
x
−
3
:
−6
(6)
−12
:
16
=
−3
:
x
−
1
(7)
4
:
2
=
2
:
x
+
4
(8)
16
:
20
=
−3
x
:
15
(9)
−12
:
3
x
=
12
:
9
(10)
−2
:
−1
=
8
:
4
x
(11)
20
:
4
x
=
−4
:
−16
(12)
10
:
−
x
=
5
:
−2
(13)
−5
x
:
−60
=
−5
:
−20
(14)
−5
x
:
−5
=
−15
:
5
(15)
x
+
4
:
16
=
−5
:
−20
(16)
4
:
−4
=
2
:
2
x
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−5
:
−
x
=
−10
:
−8
−10
×
(
−1
)
x
=
−5
×
(
−8
)
x
=
4
(2)
x
−
5
:
3
=
8
:
6
6
×
(
x
−
5
)
=
3
×
8
x
−
5
=
4
x
=
9
(3)
−5
:
3
=
x
−
3
:
−15
3
×
(
x
−
3
)
=
−5
×
(
−15
)
x
−
3
=
25
x
=
28
(4)
x
−
5
:
−5
=
−4
:
−20
−20
×
(
x
−
5
)
=
−5
×
(
−4
)
x
−
5
=
−1
x
=
4
(5)
−5
:
15
=
x
−
3
:
−6
15
×
(
x
−
3
)
=
−5
×
(
−6
)
x
−
3
=
2
x
=
5
(6)
−12
:
16
=
−3
:
x
−
1
−12
×
(
x
−
1
)
=
16
×
(
−3
)
x
−
1
=
4
x
=
5
(7)
4
:
2
=
2
:
x
+
4
4
×
(
x
+
4
)
=
2
×
2
x
+
4
=
1
x
=
−3
(8)
16
:
20
=
−3
x
:
15
20
×
(
−3
)
x
=
16
×
15
x
=
−4
(9)
−12
:
3
x
=
12
:
9
12
×
3
x
=
−12
×
9
x
=
−3
(10)
−2
:
−1
=
8
:
4
x
−2
×
4
x
=
−
8
x
=
1
(11)
20
:
4
x
=
−4
:
−16
−4
×
4
x
=
20
×
(
−16
)
x
=
20
(12)
10
:
−
x
=
5
:
−2
5
×
(
−1
)
x
=
10
×
(
−2
)
x
=
4
(13)
−5
x
:
−60
=
−5
:
−20
−20
×
(
−5
)
x
=
−60
×
(
−5
)
x
=
3
(14)
−5
x
:
−5
=
−15
:
5
5
×
(
−5
)
x
=
−5
×
(
−15
)
x
=
−3
(15)
x
+
4
:
16
=
−5
:
−20
−20
×
(
x
+
4
)
=
16
×
(
−5
)
x
+
4
=
4
x
=
0
(16)
4
:
−4
=
2
:
2
x
4
×
2
x
=
−4
×
2
x
=
−1