[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
:
15
=
−3
:
15
(2)
1
:
5
=
5
:
−5
x
(3)
−5
:
5
=
5
:
−5
x
(4)
−4
x
:
16
=
20
:
16
(5)
5
:
−25
=
4
:
−2
x
(6)
1
:
4
=
−1
:
x
−
1
(7)
9
:
12
=
3
:
x
−
4
(8)
−1
:
2
=
x
+
5
:
−4
(9)
x
−
5
:
−2
=
−2
:
−1
(10)
4
:
8
=
−1
:
x
−
1
(11)
125
:
5
x
=
−5
:
−1
(12)
−5
:
−5
x
=
5
:
−5
(13)
−4
x
:
−60
=
2
:
3
(14)
−10
:
−5
x
=
−10
:
−5
(15)
2
:
−4
=
5
x
:
−10
(16)
x
−
3
:
−2
=
12
:
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−
x
:
15
=
−3
:
15
15
×
(
−1
)
x
=
15
×
(
−3
)
x
=
3
(2)
1
:
5
=
5
:
−5
x
−5
x
=
5
×
5
x
=
−5
(3)
−5
:
5
=
5
:
−5
x
−5
×
(
−5
)
x
=
5
×
5
x
=
1
(4)
−4
x
:
16
=
20
:
16
16
×
(
−4
)
x
=
16
×
20
x
=
−5
(5)
5
:
−25
=
4
:
−2
x
5
×
(
−2
)
x
=
−25
×
4
x
=
10
(6)
1
:
4
=
−1
:
x
−
1
x
−
1
=
4
×
(
−1
)
x
−
1
=
−4
x
=
−3
(7)
9
:
12
=
3
:
x
−
4
9
×
(
x
−
4
)
=
12
×
3
x
−
4
=
4
x
=
8
(8)
−1
:
2
=
x
+
5
:
−4
2
×
(
x
+
5
)
=
−
(
−4
)
x
+
5
=
2
x
=
−3
(9)
x
−
5
:
−2
=
−2
:
−1
−
(
x
−
5
)
=
−2
×
(
−2
)
x
−
5
=
−4
x
=
1
(10)
4
:
8
=
−1
:
x
−
1
4
×
(
x
−
1
)
=
8
×
(
−1
)
x
−
1
=
−2
x
=
−1
(11)
125
:
5
x
=
−5
:
−1
−5
×
5
x
=
125
×
(
−1
)
x
=
5
(12)
−5
:
−5
x
=
5
:
−5
5
×
(
−5
)
x
=
−5
×
(
−5
)
x
=
−1
(13)
−4
x
:
−60
=
2
:
3
3
×
(
−4
)
x
=
−60
×
2
x
=
10
(14)
−10
:
−5
x
=
−10
:
−5
−10
×
(
−5
)
x
=
−10
×
(
−5
)
x
=
1
(15)
2
:
−4
=
5
x
:
−10
−4
×
5
x
=
2
×
(
−10
)
x
=
1
(16)
x
−
3
:
−2
=
12
:
4
4
×
(
x
−
3
)
=
−2
×
12
x
−
3
=
−6
x
=
−3