[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
:
x
+
3
=
−1
:
−5
(2)
12
:
9
=
−12
:
3
x
(3)
−15
:
−3
x
=
−5
:
−10
(4)
5
:
−15
=
3
x
:
27
(5)
−20
:
−12
=
20
:
−4
x
(6)
−4
:
5
=
4
:
x
+
4
(7)
−
x
:
−12
=
5
:
−3
(8)
−4
:
−5
=
x
+
2
:
−20
(9)
x
−
1
:
−4
=
10
:
20
(10)
4
:
−6
=
x
+
5
:
3
(11)
2
:
4
=
15
:
5
x
(12)
−3
:
3
=
x
−
2
:
−4
(13)
x
−
4
:
20
=
2
:
−5
(14)
−2
x
:
−8
=
2
:
−4
(15)
−3
:
1
=
−18
:
−2
x
(16)
−2
:
4
=
−4
:
−4
x
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
5
:
x
+
3
=
−1
:
−5
−
(
x
+
3
)
=
5
×
(
−5
)
x
+
3
=
25
x
=
22
(2)
12
:
9
=
−12
:
3
x
12
×
3
x
=
9
×
(
−12
)
x
=
−3
(3)
−15
:
−3
x
=
−5
:
−10
−5
×
(
−3
)
x
=
−15
×
(
−10
)
x
=
10
(4)
5
:
−15
=
3
x
:
27
−15
×
3
x
=
5
×
27
x
=
−3
(5)
−20
:
−12
=
20
:
−4
x
−20
×
(
−4
)
x
=
−12
×
20
x
=
−3
(6)
−4
:
5
=
4
:
x
+
4
−4
×
(
x
+
4
)
=
5
×
4
x
+
4
=
−5
x
=
−9
(7)
−
x
:
−12
=
5
:
−3
−3
×
(
−1
)
x
=
−12
×
5
x
=
−20
(8)
−4
:
−5
=
x
+
2
:
−20
−5
×
(
x
+
2
)
=
−4
×
(
−20
)
x
+
2
=
−16
x
=
−18
(9)
x
−
1
:
−4
=
10
:
20
20
×
(
x
−
1
)
=
−4
×
10
x
−
1
=
−2
x
=
−1
(10)
4
:
−6
=
x
+
5
:
3
−6
×
(
x
+
5
)
=
4
×
3
x
+
5
=
−2
x
=
−7
(11)
2
:
4
=
15
:
5
x
2
×
5
x
=
4
×
15
x
=
6
(12)
−3
:
3
=
x
−
2
:
−4
3
×
(
x
−
2
)
=
−3
×
(
−4
)
x
−
2
=
4
x
=
6
(13)
x
−
4
:
20
=
2
:
−5
−5
×
(
x
−
4
)
=
20
×
2
x
−
4
=
−8
x
=
−4
(14)
−2
x
:
−8
=
2
:
−4
−4
×
(
−2
)
x
=
−8
×
2
x
=
−2
(15)
−3
:
1
=
−18
:
−2
x
−3
×
(
−2
)
x
=
−18
x
=
−3
(16)
−2
:
4
=
−4
:
−4
x
−2
×
(
−4
)
x
=
4
×
(
−4
)
x
=
−2