[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
:
10
=
−2
x
:
−16
(2)
−5
x
:
−40
=
−3
:
12
(3)
4
:
−1
=
32
:
−2
x
(4)
x
−
4
:
1
=
12
:
3
(5)
−12
:
−3
=
−8
:
x
−
4
(6)
16
:
20
=
4
x
:
−20
(7)
−5
:
5
=
−4
x
:
4
(8)
−
x
:
−3
=
−20
:
12
(9)
x
+
5
:
4
=
−1
:
−4
(10)
5
:
−15
=
3
:
−3
x
(11)
x
+
3
:
−2
=
2
:
1
(12)
6
:
9
=
2
:
−
x
(13)
−2
x
:
20
=
4
:
8
(14)
x
+
3
:
−12
=
3
:
−9
(15)
5
:
20
=
1
:
x
+
4
(16)
−
x
:
4
=
9
:
−12
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
5
:
10
=
−2
x
:
−16
10
×
(
−2
)
x
=
5
×
(
−16
)
x
=
4
(2)
−5
x
:
−40
=
−3
:
12
12
×
(
−5
)
x
=
−40
×
(
−3
)
x
=
−2
(3)
4
:
−1
=
32
:
−2
x
4
×
(
−2
)
x
=
−
32
x
=
4
(4)
x
−
4
:
1
=
12
:
3
3
×
(
x
−
4
)
=
12
x
−
4
=
4
x
=
8
(5)
−12
:
−3
=
−8
:
x
−
4
−12
×
(
x
−
4
)
=
−3
×
(
−8
)
x
−
4
=
−2
x
=
2
(6)
16
:
20
=
4
x
:
−20
20
×
4
x
=
16
×
(
−20
)
x
=
−4
(7)
−5
:
5
=
−4
x
:
4
5
×
(
−4
)
x
=
−5
×
4
x
=
1
(8)
−
x
:
−3
=
−20
:
12
12
×
(
−1
)
x
=
−3
×
(
−20
)
x
=
−5
(9)
x
+
5
:
4
=
−1
:
−4
−4
×
(
x
+
5
)
=
4
×
(
−1
)
x
+
5
=
1
x
=
−4
(10)
5
:
−15
=
3
:
−3
x
5
×
(
−3
)
x
=
−15
×
3
x
=
3
(11)
x
+
3
:
−2
=
2
:
1
x
+
3
=
−2
×
2
x
+
3
=
−4
x
=
−7
(12)
6
:
9
=
2
:
−
x
6
×
(
−1
)
x
=
9
×
2
x
=
−3
(13)
−2
x
:
20
=
4
:
8
8
×
(
−2
)
x
=
20
×
4
x
=
−5
(14)
x
+
3
:
−12
=
3
:
−9
−9
×
(
x
+
3
)
=
−12
×
3
x
+
3
=
4
x
=
1
(15)
5
:
20
=
1
:
x
+
4
5
×
(
x
+
4
)
=
20
x
+
4
=
4
x
=
0
(16)
−
x
:
4
=
9
:
−12
−12
×
(
−1
)
x
=
4
×
9
x
=
3