[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
:
3
=
20
:
x
−
1
(2)
x
+
3
:
−1
=
−6
:
−2
(3)
−
x
:
−9
=
−4
:
−3
(4)
−1
:
x
+
5
=
−2
:
−10
(5)
5
:
−25
=
4
x
:
−60
(6)
20
:
5
=
x
+
4
:
−4
(7)
−12
:
−6
=
16
:
−4
x
(8)
4
:
−8
=
−12
:
4
x
(9)
x
+
3
:
3
=
12
:
4
(10)
−3
:
−6
=
−5
x
:
−40
(11)
−1
:
−2
=
x
+
3
:
−8
(12)
−8
:
8
=
2
:
−
x
(13)
−12
:
−3
x
=
−20
:
25
(14)
−5
:
1
=
5
:
x
+
4
(15)
2
x
:
32
=
3
:
−12
(16)
−3
:
−6
=
1
:
x
+
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
5
:
3
=
20
:
x
−
1
5
×
(
x
−
1
)
=
3
×
20
x
−
1
=
12
x
=
13
(2)
x
+
3
:
−1
=
−6
:
−2
−2
×
(
x
+
3
)
=
−
(
−6
)
x
+
3
=
−3
x
=
−6
(3)
−
x
:
−9
=
−4
:
−3
−3
×
(
−1
)
x
=
−9
×
(
−4
)
x
=
12
(4)
−1
:
x
+
5
=
−2
:
−10
−2
×
(
x
+
5
)
=
−
(
−10
)
x
+
5
=
−5
x
=
−10
(5)
5
:
−25
=
4
x
:
−60
−25
×
4
x
=
5
×
(
−60
)
x
=
3
(6)
20
:
5
=
x
+
4
:
−4
5
×
(
x
+
4
)
=
20
×
(
−4
)
x
+
4
=
−16
x
=
−20
(7)
−12
:
−6
=
16
:
−4
x
−12
×
(
−4
)
x
=
−6
×
16
x
=
−2
(8)
4
:
−8
=
−12
:
4
x
4
×
4
x
=
−8
×
(
−12
)
x
=
6
(9)
x
+
3
:
3
=
12
:
4
4
×
(
x
+
3
)
=
3
×
12
x
+
3
=
9
x
=
6
(10)
−3
:
−6
=
−5
x
:
−40
−6
×
(
−5
)
x
=
−3
×
(
−40
)
x
=
4
(11)
−1
:
−2
=
x
+
3
:
−8
−2
×
(
x
+
3
)
=
−
(
−8
)
x
+
3
=
−4
x
=
−7
(12)
−8
:
8
=
2
:
−
x
−8
×
(
−1
)
x
=
8
×
2
x
=
2
(13)
−12
:
−3
x
=
−20
:
25
−20
×
(
−3
)
x
=
−12
×
25
x
=
−5
(14)
−5
:
1
=
5
:
x
+
4
−5
×
(
x
+
4
)
=
5
x
+
4
=
−1
x
=
−5
(15)
2
x
:
32
=
3
:
−12
−12
×
2
x
=
32
×
3
x
=
−4
(16)
−3
:
−6
=
1
:
x
+
4
−3
×
(
x
+
4
)
=
−6
x
+
4
=
2
x
=
−2