[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)
x
+
5
:
2
=
4
:
−1
(2)
−1
:
x
−
1
=
4
:
−20
(3)
15
:
−9
=
−25
:
−5
x
(4)
4
:
−2
=
−2
x
:
−20
(5)
1
:
2
=
4
x
:
−8
(6)
2
:
8
=
−10
:
−2
x
(7)
x
+
4
:
3
=
5
:
−5
(8)
2
:
3
=
−2
:
x
+
2
(9)
1
:
−2
=
−5
x
:
20
(10)
−1
:
x
+
5
=
1
:
−4
(11)
4
:
−12
=
3
x
:
36
(12)
6
:
−3
x
=
−10
:
−20
(13)
24
:
−2
x
=
3
:
−4
(14)
−5
:
2
=
10
:
x
−
5
(15)
1
:
2
=
−1
:
x
−
4
(16)
x
−
1
:
−5
=
3
:
−3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
+
5
:
2
=
4
:
−1
−
(
x
+
5
)
=
2
×
4
x
+
5
=
−8
x
=
−13
(2)
−1
:
x
−
1
=
4
:
−20
4
×
(
x
−
1
)
=
−
(
−20
)
x
−
1
=
5
x
=
6
(3)
15
:
−9
=
−25
:
−5
x
15
×
(
−5
)
x
=
−9
×
(
−25
)
x
=
−3
(4)
4
:
−2
=
−2
x
:
−20
−2
×
(
−2
)
x
=
4
×
(
−20
)
x
=
−20
(5)
1
:
2
=
4
x
:
−8
2
×
4
x
=
−8
x
=
−1
(6)
2
:
8
=
−10
:
−2
x
2
×
(
−2
)
x
=
8
×
(
−10
)
x
=
20
(7)
x
+
4
:
3
=
5
:
−5
−5
×
(
x
+
4
)
=
3
×
5
x
+
4
=
−3
x
=
−7
(8)
2
:
3
=
−2
:
x
+
2
2
×
(
x
+
2
)
=
3
×
(
−2
)
x
+
2
=
−3
x
=
−5
(9)
1
:
−2
=
−5
x
:
20
−2
×
(
−5
)
x
=
20
x
=
2
(10)
−1
:
x
+
5
=
1
:
−4
x
+
5
=
−
(
−4
)
x
+
5
=
4
x
=
−1
(11)
4
:
−12
=
3
x
:
36
−12
×
3
x
=
4
×
36
x
=
−4
(12)
6
:
−3
x
=
−10
:
−20
−10
×
(
−3
)
x
=
6
×
(
−20
)
x
=
−4
(13)
24
:
−2
x
=
3
:
−4
3
×
(
−2
)
x
=
24
×
(
−4
)
x
=
16
(14)
−5
:
2
=
10
:
x
−
5
−5
×
(
x
−
5
)
=
2
×
10
x
−
5
=
−4
x
=
1
(15)
1
:
2
=
−1
:
x
−
4
x
−
4
=
2
×
(
−1
)
x
−
4
=
−2
x
=
2
(16)
x
−
1
:
−5
=
3
:
−3
−3
×
(
x
−
1
)
=
−5
×
3
x
−
1
=
5
x
=
6