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©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)
−10
:
−5
=
−4
:
x
+
5
(2)
−3
:
15
=
x
−
5
:
−25
(3)
3
:
−3
=
75
:
−5
x
(4)
5
:
−2
=
4
x
:
32
(5)
−2
:
−4
=
24
:
3
x
(6)
−10
:
x
−
4
=
−2
:
−1
(7)
1
:
x
+
5
=
5
:
−5
(8)
−2
:
−4
=
1
:
x
−
2
(9)
−15
:
−12
=
5
x
:
20
(10)
16
:
4
=
16
:
−4
x
(11)
8
:
−4
=
4
:
x
−
1
(12)
20
:
−4
x
=
−1
:
−5
(13)
−12
:
4
x
=
−15
:
5
(14)
x
−
1
:
−4
=
25
:
−5
(15)
1
:
−2
=
−6
:
−3
x
(16)
6
:
x
+
3
=
8
:
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−10
:
−5
=
−4
:
x
+
5
−10
×
(
x
+
5
)
=
−5
×
(
−4
)
x
+
5
=
−2
x
=
−7
(2)
−3
:
15
=
x
−
5
:
−25
15
×
(
x
−
5
)
=
−3
×
(
−25
)
x
−
5
=
5
x
=
10
(3)
3
:
−3
=
75
:
−5
x
3
×
(
−5
)
x
=
−3
×
75
x
=
15
(4)
5
:
−2
=
4
x
:
32
−2
×
4
x
=
5
×
32
x
=
−20
(5)
−2
:
−4
=
24
:
3
x
−2
×
3
x
=
−4
×
24
x
=
16
(6)
−10
:
x
−
4
=
−2
:
−1
−2
×
(
x
−
4
)
=
−10
×
(
−1
)
x
−
4
=
−5
x
=
−1
(7)
1
:
x
+
5
=
5
:
−5
5
×
(
x
+
5
)
=
−5
x
+
5
=
−1
x
=
−6
(8)
−2
:
−4
=
1
:
x
−
2
−2
×
(
x
−
2
)
=
−4
x
−
2
=
2
x
=
4
(9)
−15
:
−12
=
5
x
:
20
−12
×
5
x
=
−15
×
20
x
=
5
(10)
16
:
4
=
16
:
−4
x
16
×
(
−4
)
x
=
4
×
16
x
=
−1
(11)
8
:
−4
=
4
:
x
−
1
8
×
(
x
−
1
)
=
−4
×
4
x
−
1
=
−2
x
=
−1
(12)
20
:
−4
x
=
−1
:
−5
−
(
−4
)
x
=
20
×
(
−5
)
x
=
−25
(13)
−12
:
4
x
=
−15
:
5
−15
×
4
x
=
−12
×
5
x
=
1
(14)
x
−
1
:
−4
=
25
:
−5
−5
×
(
x
−
1
)
=
−4
×
25
x
−
1
=
20
x
=
21
(15)
1
:
−2
=
−6
:
−3
x
−3
x
=
−2
×
(
−6
)
x
=
−4
(16)
6
:
x
+
3
=
8
:
4
8
×
(
x
+
3
)
=
6
×
4
x
+
3
=
3
x
=
0