[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
:
−10
=
−25
:
10
(2)
−3
:
−
x
=
−1
:
−3
(3)
−16
:
−2
x
=
−10
:
−5
(4)
5
:
−1
=
x
−
5
:
−5
(5)
x
+
3
:
−1
=
−12
:
−3
(6)
3
:
x
−
4
=
−12
:
−8
(7)
−3
:
3
=
x
−
4
:
−5
(8)
−5
x
:
−60
=
1
:
4
(9)
4
:
2
=
−10
:
x
−
1
(10)
1
:
−1
=
x
−
1
:
−4
(11)
−20
:
4
=
x
+
3
:
−5
(12)
−1
:
2
=
4
x
:
−8
(13)
−40
:
−5
x
=
2
:
−1
(14)
−2
x
:
−32
=
5
:
4
(15)
5
x
:
75
=
2
:
10
(16)
−2
x
:
−10
=
8
:
−2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−5
x
:
−10
=
−25
:
10
10
×
(
−5
)
x
=
−10
×
(
−25
)
x
=
−5
(2)
−3
:
−
x
=
−1
:
−3
x
=
−3
×
(
−3
)
x
=
9
(3)
−16
:
−2
x
=
−10
:
−5
−10
×
(
−2
)
x
=
−16
×
(
−5
)
x
=
4
(4)
5
:
−1
=
x
−
5
:
−5
−
(
x
−
5
)
=
5
×
(
−5
)
x
−
5
=
25
x
=
30
(5)
x
+
3
:
−1
=
−12
:
−3
−3
×
(
x
+
3
)
=
−
(
−12
)
x
+
3
=
−4
x
=
−7
(6)
3
:
x
−
4
=
−12
:
−8
−12
×
(
x
−
4
)
=
3
×
(
−8
)
x
−
4
=
2
x
=
6
(7)
−3
:
3
=
x
−
4
:
−5
3
×
(
x
−
4
)
=
−3
×
(
−5
)
x
−
4
=
5
x
=
9
(8)
−5
x
:
−60
=
1
:
4
4
×
(
−5
)
x
=
−60
x
=
3
(9)
4
:
2
=
−10
:
x
−
1
4
×
(
x
−
1
)
=
2
×
(
−10
)
x
−
1
=
−5
x
=
−4
(10)
1
:
−1
=
x
−
1
:
−4
−
(
x
−
1
)
=
−4
x
−
1
=
4
x
=
5
(11)
−20
:
4
=
x
+
3
:
−5
4
×
(
x
+
3
)
=
−20
×
(
−5
)
x
+
3
=
25
x
=
22
(12)
−1
:
2
=
4
x
:
−8
2
×
4
x
=
−
(
−8
)
x
=
1
(13)
−40
:
−5
x
=
2
:
−1
2
×
(
−5
)
x
=
−40
×
(
−1
)
x
=
−4
(14)
−2
x
:
−32
=
5
:
4
4
×
(
−2
)
x
=
−32
×
5
x
=
20
(15)
5
x
:
75
=
2
:
10
10
×
5
x
=
75
×
2
x
=
3
(16)
−2
x
:
−10
=
8
:
−2
−2
×
(
−2
)
x
=
−10
×
8
x
=
−20