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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)
3
:
6
=
5
x
:
−10
(2)
−30
:
2
x
=
−5
:
4
(3)
−5
:
5
x
=
−4
:
16
(4)
x
−
2
:
−2
=
6
:
−4
(5)
−1
:
4
=
−5
x
:
80
(6)
5
:
−5
=
−
x
:
20
(7)
−6
:
−3
=
x
−
3
:
−1
(8)
4
:
2
=
x
+
2
:
1
(9)
−3
:
−4
=
2
x
:
24
(10)
−10
:
−20
=
−2
:
x
+
2
(11)
8
:
2
x
=
−8
:
−10
(12)
5
x
:
−15
=
−1
:
3
(13)
−20
:
x
−
4
=
−10
:
−2
(14)
−15
:
−12
=
x
−
1
:
−4
(15)
8
:
−2
x
=
−12
:
3
(16)
x
−
5
:
−5
=
−20
:
5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
3
:
6
=
5
x
:
−10
6
×
5
x
=
3
×
(
−10
)
x
=
−1
(2)
−30
:
2
x
=
−5
:
4
−5
×
2
x
=
−30
×
4
x
=
12
(3)
−5
:
5
x
=
−4
:
16
−4
×
5
x
=
−5
×
16
x
=
4
(4)
x
−
2
:
−2
=
6
:
−4
−4
×
(
x
−
2
)
=
−2
×
6
x
−
2
=
3
x
=
5
(5)
−1
:
4
=
−5
x
:
80
4
×
(
−5
)
x
=
−
80
x
=
4
(6)
5
:
−5
=
−
x
:
20
−5
×
(
−1
)
x
=
5
×
20
x
=
20
(7)
−6
:
−3
=
x
−
3
:
−1
−3
×
(
x
−
3
)
=
−6
×
(
−1
)
x
−
3
=
−2
x
=
1
(8)
4
:
2
=
x
+
2
:
1
2
×
(
x
+
2
)
=
4
x
+
2
=
2
x
=
0
(9)
−3
:
−4
=
2
x
:
24
−4
×
2
x
=
−3
×
24
x
=
9
(10)
−10
:
−20
=
−2
:
x
+
2
−10
×
(
x
+
2
)
=
−20
×
(
−2
)
x
+
2
=
−4
x
=
−6
(11)
8
:
2
x
=
−8
:
−10
−8
×
2
x
=
8
×
(
−10
)
x
=
5
(12)
5
x
:
−15
=
−1
:
3
3
×
5
x
=
−15
×
(
−1
)
x
=
1
(13)
−20
:
x
−
4
=
−10
:
−2
−10
×
(
x
−
4
)
=
−20
×
(
−2
)
x
−
4
=
−4
x
=
0
(14)
−15
:
−12
=
x
−
1
:
−4
−12
×
(
x
−
1
)
=
−15
×
(
−4
)
x
−
1
=
−5
x
=
−4
(15)
8
:
−2
x
=
−12
:
3
−12
×
(
−2
)
x
=
8
×
3
x
=
1
(16)
x
−
5
:
−5
=
−20
:
5
5
×
(
x
−
5
)
=
−5
×
(
−20
)
x
−
5
=
20
x
=
25