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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
:
−4
=
−3
x
:
−48
(2)
−2
:
10
=
x
−
1
:
5
(3)
−10
:
10
=
x
+
2
:
5
(4)
6
:
−3
=
−4
:
x
+
3
(5)
−6
:
−4
=
3
:
x
−
5
(6)
−3
:
x
−
1
=
−12
:
−16
(7)
−2
x
:
−8
=
3
:
−3
(8)
3
:
−6
=
12
:
3
x
(9)
−15
:
3
=
−80
:
4
x
(10)
−4
:
4
=
5
x
:
10
(11)
−2
:
x
+
2
=
2
:
−1
(12)
5
x
:
20
=
10
:
−2
(13)
−2
:
−8
=
−4
:
−4
x
(14)
−3
x
:
−9
=
10
:
−6
(15)
−3
:
9
=
20
:
4
x
(16)
1
:
4
=
5
x
:
−20
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−1
:
−4
=
−3
x
:
−48
−4
×
(
−3
)
x
=
−
(
−48
)
x
=
4
(2)
−2
:
10
=
x
−
1
:
5
10
×
(
x
−
1
)
=
−2
×
5
x
−
1
=
−1
x
=
0
(3)
−10
:
10
=
x
+
2
:
5
10
×
(
x
+
2
)
=
−10
×
5
x
+
2
=
−5
x
=
−7
(4)
6
:
−3
=
−4
:
x
+
3
6
×
(
x
+
3
)
=
−3
×
(
−4
)
x
+
3
=
2
x
=
−1
(5)
−6
:
−4
=
3
:
x
−
5
−6
×
(
x
−
5
)
=
−4
×
3
x
−
5
=
2
x
=
7
(6)
−3
:
x
−
1
=
−12
:
−16
−12
×
(
x
−
1
)
=
−3
×
(
−16
)
x
−
1
=
−4
x
=
−3
(7)
−2
x
:
−8
=
3
:
−3
−3
×
(
−2
)
x
=
−8
×
3
x
=
−4
(8)
3
:
−6
=
12
:
3
x
3
×
3
x
=
−6
×
12
x
=
−8
(9)
−15
:
3
=
−80
:
4
x
−15
×
4
x
=
3
×
(
−80
)
x
=
4
(10)
−4
:
4
=
5
x
:
10
4
×
5
x
=
−4
×
10
x
=
−2
(11)
−2
:
x
+
2
=
2
:
−1
2
×
(
x
+
2
)
=
−2
×
(
−1
)
x
+
2
=
1
x
=
−1
(12)
5
x
:
20
=
10
:
−2
−2
×
5
x
=
20
×
10
x
=
−20
(13)
−2
:
−8
=
−4
:
−4
x
−2
×
(
−4
)
x
=
−8
×
(
−4
)
x
=
4
(14)
−3
x
:
−9
=
10
:
−6
−6
×
(
−3
)
x
=
−9
×
10
x
=
−5
(15)
−3
:
9
=
20
:
4
x
−3
×
4
x
=
9
×
20
x
=
−15
(16)
1
:
4
=
5
x
:
−20
4
×
5
x
=
−20
x
=
−1