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