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