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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)
−5
:
−3
=
−15
:
x
+
4
(2)
2
:
−4
=
−3
:
−3
x
(3)
−5
:
−1
=
2
x
:
2
(4)
x
+
4
:
8
=
−3
:
−4
(5)
5
:
15
=
−4
x
:
12
(6)
2
:
3
=
4
x
:
24
(7)
40
:
−4
x
=
−2
:
2
(8)
x
−
5
:
−3
=
25
:
15
(9)
−5
x
:
−10
=
5
:
−1
(10)
x
−
2
:
−3
=
12
:
−9
(11)
x
−
2
:
−2
=
−25
:
10
(12)
8
:
4
x
=
1
:
2
(13)
2
:
3
=
−
x
:
9
(14)
−4
x
:
−32
=
3
:
−4
(15)
−3
:
−1
=
−9
:
x
−
2
(16)
3
:
x
+
3
=
−12
:
8
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−5
:
−3
=
−15
:
x
+
4
−5
×
(
x
+
4
)
=
−3
×
(
−15
)
x
+
4
=
−9
x
=
−13
(2)
2
:
−4
=
−3
:
−3
x
2
×
(
−3
)
x
=
−4
×
(
−3
)
x
=
−2
(3)
−5
:
−1
=
2
x
:
2
−
2
x
=
−5
×
2
x
=
5
(4)
x
+
4
:
8
=
−3
:
−4
−4
×
(
x
+
4
)
=
8
×
(
−3
)
x
+
4
=
6
x
=
2
(5)
5
:
15
=
−4
x
:
12
15
×
(
−4
)
x
=
5
×
12
x
=
−1
(6)
2
:
3
=
4
x
:
24
3
×
4
x
=
2
×
24
x
=
4
(7)
40
:
−4
x
=
−2
:
2
−2
×
(
−4
)
x
=
40
×
2
x
=
10
(8)
x
−
5
:
−3
=
25
:
15
15
×
(
x
−
5
)
=
−3
×
25
x
−
5
=
−5
x
=
0
(9)
−5
x
:
−10
=
5
:
−1
−
(
−5
)
x
=
−10
×
5
x
=
−10
(10)
x
−
2
:
−3
=
12
:
−9
−9
×
(
x
−
2
)
=
−3
×
12
x
−
2
=
4
x
=
6
(11)
x
−
2
:
−2
=
−25
:
10
10
×
(
x
−
2
)
=
−2
×
(
−25
)
x
−
2
=
5
x
=
7
(12)
8
:
4
x
=
1
:
2
4
x
=
8
×
2
x
=
4
(13)
2
:
3
=
−
x
:
9
3
×
(
−1
)
x
=
2
×
9
x
=
−6
(14)
−4
x
:
−32
=
3
:
−4
−4
×
(
−4
)
x
=
−32
×
3
x
=
−6
(15)
−3
:
−1
=
−9
:
x
−
2
−3
×
(
x
−
2
)
=
−
(
−9
)
x
−
2
=
−3
x
=
−1
(16)
3
:
x
+
3
=
−12
:
8
−12
×
(
x
+
3
)
=
3
×
8
x
+
3
=
−2
x
=
−5