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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
=
−3
x
:
−6
(2)
−12
:
4
x
=
5
:
−10
(3)
75
:
−5
x
=
−3
:
−1
(4)
5
:
−5
x
=
5
:
15
(5)
12
:
−3
=
−16
:
x
+
2
(6)
−5
x
:
−100
=
−2
:
8
(7)
−4
x
:
16
=
10
:
5
(8)
4
:
−2
x
=
2
:
−4
(9)
16
:
−4
=
4
:
x
+
2
(10)
−6
:
−3
x
=
1
:
2
(11)
x
−
3
:
1
=
15
:
5
(12)
3
:
5
=
5
x
:
−100
(13)
−1
:
4
=
3
:
x
−
5
(14)
−12
:
−3
x
=
10
:
−5
(15)
2
:
4
=
3
:
3
x
(16)
3
:
12
=
x
−
4
:
−12
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
10
:
5
=
−3
x
:
−6
5
×
(
−3
)
x
=
10
×
(
−6
)
x
=
4
(2)
−12
:
4
x
=
5
:
−10
5
×
4
x
=
−12
×
(
−10
)
x
=
6
(3)
75
:
−5
x
=
−3
:
−1
−3
×
(
−5
)
x
=
75
×
(
−1
)
x
=
−5
(4)
5
:
−5
x
=
5
:
15
5
×
(
−5
)
x
=
5
×
15
x
=
−3
(5)
12
:
−3
=
−16
:
x
+
2
12
×
(
x
+
2
)
=
−3
×
(
−16
)
x
+
2
=
4
x
=
2
(6)
−5
x
:
−100
=
−2
:
8
8
×
(
−5
)
x
=
−100
×
(
−2
)
x
=
−5
(7)
−4
x
:
16
=
10
:
5
5
×
(
−4
)
x
=
16
×
10
x
=
−8
(8)
4
:
−2
x
=
2
:
−4
2
×
(
−2
)
x
=
4
×
(
−4
)
x
=
4
(9)
16
:
−4
=
4
:
x
+
2
16
×
(
x
+
2
)
=
−4
×
4
x
+
2
=
−1
x
=
−3
(10)
−6
:
−3
x
=
1
:
2
−3
x
=
−6
×
2
x
=
4
(11)
x
−
3
:
1
=
15
:
5
5
×
(
x
−
3
)
=
15
x
−
3
=
3
x
=
6
(12)
3
:
5
=
5
x
:
−100
5
×
5
x
=
3
×
(
−100
)
x
=
−12
(13)
−1
:
4
=
3
:
x
−
5
−
(
x
−
5
)
=
4
×
3
x
−
5
=
−12
x
=
−7
(14)
−12
:
−3
x
=
10
:
−5
10
×
(
−3
)
x
=
−12
×
(
−5
)
x
=
−2
(15)
2
:
4
=
3
:
3
x
2
×
3
x
=
4
×
3
x
=
2
(16)
3
:
12
=
x
−
4
:
−12
12
×
(
x
−
4
)
=
3
×
(
−12
)
x
−
4
=
−3
x
=
1