[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
+
2
:
2
=
−3
:
3
(2)
−25
:
−5
x
=
−25
:
−10
(3)
−12
:
15
=
4
:
x
−
2
(4)
−8
:
2
=
−8
:
−2
x
(5)
−15
:
−5
x
=
−3
:
−2
(6)
4
:
−1
=
−40
:
2
x
(7)
4
x
:
−80
=
−4
:
20
(8)
−5
:
−3
=
x
+
5
:
3
(9)
5
:
x
−
4
=
−5
:
5
(10)
−4
:
−2
=
12
:
−
x
(11)
3
:
−1
=
60
:
−5
x
(12)
2
x
:
−4
=
−6
:
−4
(13)
x
+
4
:
−3
=
−8
:
4
(14)
x
−
5
:
15
=
−1
:
−5
(15)
−4
:
2
=
x
−
5
:
1
(16)
−5
:
−20
=
−
x
:
−16
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
+
2
:
2
=
−3
:
3
3
×
(
x
+
2
)
=
2
×
(
−3
)
x
+
2
=
−2
x
=
−4
(2)
−25
:
−5
x
=
−25
:
−10
−25
×
(
−5
)
x
=
−25
×
(
−10
)
x
=
2
(3)
−12
:
15
=
4
:
x
−
2
−12
×
(
x
−
2
)
=
15
×
4
x
−
2
=
−5
x
=
−3
(4)
−8
:
2
=
−8
:
−2
x
−8
×
(
−2
)
x
=
2
×
(
−8
)
x
=
−1
(5)
−15
:
−5
x
=
−3
:
−2
−3
×
(
−5
)
x
=
−15
×
(
−2
)
x
=
2
(6)
4
:
−1
=
−40
:
2
x
4
×
2
x
=
−
(
−40
)
x
=
5
(7)
4
x
:
−80
=
−4
:
20
20
×
4
x
=
−80
×
(
−4
)
x
=
4
(8)
−5
:
−3
=
x
+
5
:
3
−3
×
(
x
+
5
)
=
−5
×
3
x
+
5
=
5
x
=
0
(9)
5
:
x
−
4
=
−5
:
5
−5
×
(
x
−
4
)
=
5
×
5
x
−
4
=
−5
x
=
−1
(10)
−4
:
−2
=
12
:
−
x
−4
×
(
−1
)
x
=
−2
×
12
x
=
−6
(11)
3
:
−1
=
60
:
−5
x
3
×
(
−5
)
x
=
−
60
x
=
4
(12)
2
x
:
−4
=
−6
:
−4
−4
×
2
x
=
−4
×
(
−6
)
x
=
−3
(13)
x
+
4
:
−3
=
−8
:
4
4
×
(
x
+
4
)
=
−3
×
(
−8
)
x
+
4
=
6
x
=
2
(14)
x
−
5
:
15
=
−1
:
−5
−5
×
(
x
−
5
)
=
15
×
(
−1
)
x
−
5
=
3
x
=
8
(15)
−4
:
2
=
x
−
5
:
1
2
×
(
x
−
5
)
=
−4
x
−
5
=
−2
x
=
3
(16)
−5
:
−20
=
−
x
:
−16
−20
×
(
−1
)
x
=
−5
×
(
−16
)
x
=
4