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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)
x
+
5
:
1
=
12
:
−3
(2)
−3
:
−1
=
−12
:
x
−
4
(3)
25
:
10
=
5
:
x
+
5
(4)
x
−
3
:
3
=
−25
:
−5
(5)
−2
:
−4
=
10
:
5
x
(6)
x
−
5
:
4
=
6
:
−12
(7)
x
−
5
:
−1
=
12
:
4
(8)
−2
:
10
=
−1
:
x
−
5
(9)
9
:
−3
x
=
−6
:
−10
(10)
5
:
−5
=
−5
:
x
−
5
(11)
x
+
4
:
−8
=
3
:
−4
(12)
2
:
3
=
−2
x
:
−12
(13)
4
:
−1
=
8
:
x
+
4
(14)
10
:
−5
=
−
x
:
−3
(15)
−4
:
−8
=
4
x
:
−24
(16)
5
:
3
=
x
−
3
:
−3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
+
5
:
1
=
12
:
−3
−3
×
(
x
+
5
)
=
12
x
+
5
=
−4
x
=
−9
(2)
−3
:
−1
=
−12
:
x
−
4
−3
×
(
x
−
4
)
=
−
(
−12
)
x
−
4
=
−4
x
=
0
(3)
25
:
10
=
5
:
x
+
5
25
×
(
x
+
5
)
=
10
×
5
x
+
5
=
2
x
=
−3
(4)
x
−
3
:
3
=
−25
:
−5
−5
×
(
x
−
3
)
=
3
×
(
−25
)
x
−
3
=
15
x
=
18
(5)
−2
:
−4
=
10
:
5
x
−2
×
5
x
=
−4
×
10
x
=
4
(6)
x
−
5
:
4
=
6
:
−12
−12
×
(
x
−
5
)
=
4
×
6
x
−
5
=
−2
x
=
3
(7)
x
−
5
:
−1
=
12
:
4
4
×
(
x
−
5
)
=
−
12
x
−
5
=
−3
x
=
2
(8)
−2
:
10
=
−1
:
x
−
5
−2
×
(
x
−
5
)
=
10
×
(
−1
)
x
−
5
=
5
x
=
10
(9)
9
:
−3
x
=
−6
:
−10
−6
×
(
−3
)
x
=
9
×
(
−10
)
x
=
−5
(10)
5
:
−5
=
−5
:
x
−
5
5
×
(
x
−
5
)
=
−5
×
(
−5
)
x
−
5
=
5
x
=
10
(11)
x
+
4
:
−8
=
3
:
−4
−4
×
(
x
+
4
)
=
−8
×
3
x
+
4
=
6
x
=
2
(12)
2
:
3
=
−2
x
:
−12
3
×
(
−2
)
x
=
2
×
(
−12
)
x
=
4
(13)
4
:
−1
=
8
:
x
+
4
4
×
(
x
+
4
)
=
−
8
x
+
4
=
−2
x
=
−6
(14)
10
:
−5
=
−
x
:
−3
−5
×
(
−1
)
x
=
10
×
(
−3
)
x
=
−6
(15)
−4
:
−8
=
4
x
:
−24
−8
×
4
x
=
−4
×
(
−24
)
x
=
−3
(16)
5
:
3
=
x
−
3
:
−3
3
×
(
x
−
3
)
=
5
×
(
−3
)
x
−
3
=
−5
x
=
−2