[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
[0G0-00]
(1)
−5
:
−1
=
5
:
x
(2)
−5
:
−4
=
x
:
4
(3)
−2
:
x
=
1
:
−2
(4)
x
:
4
=
−1
:
−4
(5)
−4
:
2
=
x
:
−5
(6)
4
:
−2
=
2
:
x
(7)
−2
:
4
=
x
:
−10
(8)
5
:
x
=
2
:
−4
(9)
x
:
−20
=
3
:
−12
(10)
x
:
−2
=
1
:
−1
(11)
4
:
−5
=
8
:
x
(12)
−4
:
x
=
−2
:
1
(13)
−5
:
x
=
5
:
−4
(14)
−3
:
9
=
4
:
x
(15)
8
:
−8
=
−2
:
x
(16)
1
:
x
=
−1
:
3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−5
:
−1
=
5
:
x
−5
x
=
−
5
x
=
1
(2)
−5
:
−4
=
x
:
4
−4
x
=
−5
×
4
x
=
5
(3)
−2
:
x
=
1
:
−2
x
=
−2
×
(
−2
)
x
=
4
(4)
x
:
4
=
−1
:
−4
−4
x
=
4
×
(
−1
)
x
=
1
(5)
−4
:
2
=
x
:
−5
2
x
=
−4
×
(
−5
)
x
=
10
(6)
4
:
−2
=
2
:
x
4
x
=
−2
×
2
x
=
−1
(7)
−2
:
4
=
x
:
−10
4
x
=
−2
×
(
−10
)
x
=
5
(8)
5
:
x
=
2
:
−4
2
x
=
5
×
(
−4
)
x
=
−10
(9)
x
:
−20
=
3
:
−12
−12
x
=
−20
×
3
x
=
5
(10)
x
:
−2
=
1
:
−1
−
x
=
−2
x
=
2
(11)
4
:
−5
=
8
:
x
4
x
=
−5
×
8
x
=
−10
(12)
−4
:
x
=
−2
:
1
−2
x
=
−4
x
=
2
(13)
−5
:
x
=
5
:
−4
5
x
=
−5
×
(
−4
)
x
=
4
(14)
−3
:
9
=
4
:
x
−3
x
=
9
×
4
x
=
−12
(15)
8
:
−8
=
−2
:
x
8
x
=
−8
×
(
−2
)
x
=
2
(16)
1
:
x
=
−1
:
3
−
x
=
3
x
=
−3