[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
:
−4
=
−10
:
x
+
2
(2)
−2
x
:
10
=
20
:
−20
(3)
−5
:
−1
=
−2
x
:
−10
(4)
−1
:
4
=
−2
:
−2
x
(5)
−3
x
:
−60
=
2
:
8
(6)
25
:
−5
=
−5
x
:
15
(7)
10
:
2
=
x
−
4
:
−5
(8)
−
x
:
−4
=
−20
:
−5
(9)
3
:
12
=
2
x
:
−24
(10)
4
:
5
=
−20
:
x
−
3
(11)
1
:
x
−
1
=
4
:
−4
(12)
−2
:
x
−
1
=
10
:
5
(13)
5
:
2
=
−
x
:
2
(14)
50
:
−2
x
=
−5
:
5
(15)
5
:
−15
=
−1
:
x
−
1
(16)
−5
:
−15
=
x
−
2
:
3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
5
:
−4
=
−10
:
x
+
2
5
×
(
x
+
2
)
=
−4
×
(
−10
)
x
+
2
=
8
x
=
6
(2)
−2
x
:
10
=
20
:
−20
−20
×
(
−2
)
x
=
10
×
20
x
=
5
(3)
−5
:
−1
=
−2
x
:
−10
−
(
−2
)
x
=
−5
×
(
−10
)
x
=
25
(4)
−1
:
4
=
−2
:
−2
x
−
(
−2
)
x
=
4
×
(
−2
)
x
=
−4
(5)
−3
x
:
−60
=
2
:
8
8
×
(
−3
)
x
=
−60
×
2
x
=
5
(6)
25
:
−5
=
−5
x
:
15
−5
×
(
−5
)
x
=
25
×
15
x
=
15
(7)
10
:
2
=
x
−
4
:
−5
2
×
(
x
−
4
)
=
10
×
(
−5
)
x
−
4
=
−25
x
=
−21
(8)
−
x
:
−4
=
−20
:
−5
−5
×
(
−1
)
x
=
−4
×
(
−20
)
x
=
16
(9)
3
:
12
=
2
x
:
−24
12
×
2
x
=
3
×
(
−24
)
x
=
−3
(10)
4
:
5
=
−20
:
x
−
3
4
×
(
x
−
3
)
=
5
×
(
−20
)
x
−
3
=
−25
x
=
−22
(11)
1
:
x
−
1
=
4
:
−4
4
×
(
x
−
1
)
=
−4
x
−
1
=
−1
x
=
0
(12)
−2
:
x
−
1
=
10
:
5
10
×
(
x
−
1
)
=
−2
×
5
x
−
1
=
−1
x
=
0
(13)
5
:
2
=
−
x
:
2
2
×
(
−1
)
x
=
5
×
2
x
=
−5
(14)
50
:
−2
x
=
−5
:
5
−5
×
(
−2
)
x
=
50
×
5
x
=
25
(15)
5
:
−15
=
−1
:
x
−
1
5
×
(
x
−
1
)
=
−15
×
(
−1
)
x
−
1
=
3
x
=
4
(16)
−5
:
−15
=
x
−
2
:
3
−15
×
(
x
−
2
)
=
−5
×
3
x
−
2
=
1
x
=
3