[文字サイズの変更]
▼
▲
©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
:
−4
=
−5
x
:
−40
(2)
−3
:
12
=
−5
x
:
20
(3)
−3
:
−
x
=
12
:
−16
(4)
−1
:
1
=
2
:
x
−
1
(5)
15
:
x
−
1
=
5
:
2
(6)
10
:
5
x
=
−3
:
−12
(7)
3
:
−6
=
4
:
−4
x
(8)
−5
:
20
=
−8
:
−4
x
(9)
−1
:
−5
=
−5
x
:
100
(10)
−5
:
−2
=
x
+
2
:
2
(11)
−2
:
2
=
−4
x
:
−4
(12)
−6
:
−2
x
=
−9
:
−15
(13)
4
x
:
−4
=
12
:
3
(14)
5
:
−10
=
−10
:
5
x
(15)
x
−
1
:
−2
=
6
:
2
(16)
−10
:
15
=
x
+
5
:
−3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−5
:
−4
=
−5
x
:
−40
−4
×
(
−5
)
x
=
−5
×
(
−40
)
x
=
10
(2)
−3
:
12
=
−5
x
:
20
12
×
(
−5
)
x
=
−3
×
20
x
=
1
(3)
−3
:
−
x
=
12
:
−16
12
×
(
−1
)
x
=
−3
×
(
−16
)
x
=
−4
(4)
−1
:
1
=
2
:
x
−
1
−
(
x
−
1
)
=
2
x
−
1
=
−2
x
=
−1
(5)
15
:
x
−
1
=
5
:
2
5
×
(
x
−
1
)
=
15
×
2
x
−
1
=
6
x
=
7
(6)
10
:
5
x
=
−3
:
−12
−3
×
5
x
=
10
×
(
−12
)
x
=
8
(7)
3
:
−6
=
4
:
−4
x
3
×
(
−4
)
x
=
−6
×
4
x
=
2
(8)
−5
:
20
=
−8
:
−4
x
−5
×
(
−4
)
x
=
20
×
(
−8
)
x
=
−8
(9)
−1
:
−5
=
−5
x
:
100
−5
×
(
−5
)
x
=
−
100
x
=
−4
(10)
−5
:
−2
=
x
+
2
:
2
−2
×
(
x
+
2
)
=
−5
×
2
x
+
2
=
5
x
=
3
(11)
−2
:
2
=
−4
x
:
−4
2
×
(
−4
)
x
=
−2
×
(
−4
)
x
=
−1
(12)
−6
:
−2
x
=
−9
:
−15
−9
×
(
−2
)
x
=
−6
×
(
−15
)
x
=
5
(13)
4
x
:
−4
=
12
:
3
3
×
4
x
=
−4
×
12
x
=
−4
(14)
5
:
−10
=
−10
:
5
x
5
×
5
x
=
−10
×
(
−10
)
x
=
4
(15)
x
−
1
:
−2
=
6
:
2
2
×
(
x
−
1
)
=
−2
×
6
x
−
1
=
−6
x
=
−5
(16)
−10
:
15
=
x
+
5
:
−3
15
×
(
x
+
5
)
=
−10
×
(
−3
)
x
+
5
=
2
x
=
−3