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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
x
:
5
=
6
:
−2
(2)
15
:
−3
=
−25
:
x
+
4
(3)
−3
:
1
=
−5
x
:
−25
(4)
x
−
4
:
2
=
−1
:
−2
(5)
−8
:
−2
=
40
:
5
x
(6)
2
:
−3
=
x
+
4
:
3
(7)
9
:
−12
=
x
−
3
:
−4
(8)
−5
:
10
=
4
x
:
24
(9)
−5
:
x
+
4
=
−10
:
2
(10)
−1
:
1
=
8
:
−2
x
(11)
5
:
15
=
−2
x
:
−24
(12)
x
−
5
:
−5
=
−2
:
2
(13)
−5
:
−4
=
20
:
x
+
2
(14)
−4
:
−12
=
15
:
3
x
(15)
−4
:
2
x
=
8
:
−12
(16)
x
−
5
:
1
=
10
:
−5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
5
x
:
5
=
6
:
−2
−2
×
5
x
=
5
×
6
x
=
−3
(2)
15
:
−3
=
−25
:
x
+
4
15
×
(
x
+
4
)
=
−3
×
(
−25
)
x
+
4
=
5
x
=
1
(3)
−3
:
1
=
−5
x
:
−25
−5
x
=
−3
×
(
−25
)
x
=
−15
(4)
x
−
4
:
2
=
−1
:
−2
−2
×
(
x
−
4
)
=
2
×
(
−1
)
x
−
4
=
1
x
=
5
(5)
−8
:
−2
=
40
:
5
x
−8
×
5
x
=
−2
×
40
x
=
2
(6)
2
:
−3
=
x
+
4
:
3
−3
×
(
x
+
4
)
=
2
×
3
x
+
4
=
−2
x
=
−6
(7)
9
:
−12
=
x
−
3
:
−4
−12
×
(
x
−
3
)
=
9
×
(
−4
)
x
−
3
=
3
x
=
6
(8)
−5
:
10
=
4
x
:
24
10
×
4
x
=
−5
×
24
x
=
−3
(9)
−5
:
x
+
4
=
−10
:
2
−10
×
(
x
+
4
)
=
−5
×
2
x
+
4
=
1
x
=
−3
(10)
−1
:
1
=
8
:
−2
x
−
(
−2
)
x
=
8
x
=
4
(11)
5
:
15
=
−2
x
:
−24
15
×
(
−2
)
x
=
5
×
(
−24
)
x
=
4
(12)
x
−
5
:
−5
=
−2
:
2
2
×
(
x
−
5
)
=
−5
×
(
−2
)
x
−
5
=
5
x
=
10
(13)
−5
:
−4
=
20
:
x
+
2
−5
×
(
x
+
2
)
=
−4
×
20
x
+
2
=
16
x
=
14
(14)
−4
:
−12
=
15
:
3
x
−4
×
3
x
=
−12
×
15
x
=
15
(15)
−4
:
2
x
=
8
:
−12
8
×
2
x
=
−4
×
(
−12
)
x
=
3
(16)
x
−
5
:
1
=
10
:
−5
−5
×
(
x
−
5
)
=
10
x
−
5
=
−2
x
=
3