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©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の比例式を解きなさい
[0G1-00]
(1)
−12
:
−4
x
=
−6
:
10
(2)
−5
:
−1
=
−15
:
x
−
5
(3)
−5
:
−1
=
x
+
4
:
−4
(4)
x
+
4
:
1
=
15
:
3
(5)
4
:
−
x
=
4
:
1
(6)
10
:
−5
x
=
1
:
2
(7)
−25
:
x
−
1
=
−5
:
3
(8)
6
:
−2
x
=
3
:
−2
(9)
−2
:
x
+
3
=
−10
:
25
(10)
x
−
1
:
10
=
−2
:
−5
(11)
x
+
4
:
−4
=
15
:
5
(12)
−1
:
−5
=
3
:
x
+
4
(13)
6
:
2
=
−
x
:
1
(14)
−20
:
5
x
=
1
:
−1
(15)
x
+
2
:
−2
=
−8
:
−4
(16)
−4
:
1
=
x
+
5
:
−4
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−12
:
−4
x
=
−6
:
10
−6
×
(
−4
)
x
=
−12
×
10
x
=
−5
(2)
−5
:
−1
=
−15
:
x
−
5
−5
×
(
x
−
5
)
=
−
(
−15
)
x
−
5
=
−3
x
=
2
(3)
−5
:
−1
=
x
+
4
:
−4
−
(
x
+
4
)
=
−5
×
(
−4
)
x
+
4
=
−20
x
=
−24
(4)
x
+
4
:
1
=
15
:
3
3
×
(
x
+
4
)
=
15
x
+
4
=
5
x
=
1
(5)
4
:
−
x
=
4
:
1
4
×
(
−1
)
x
=
4
x
=
−1
(6)
10
:
−5
x
=
1
:
2
−5
x
=
10
×
2
x
=
−4
(7)
−25
:
x
−
1
=
−5
:
3
−5
×
(
x
−
1
)
=
−25
×
3
x
−
1
=
15
x
=
16
(8)
6
:
−2
x
=
3
:
−2
3
×
(
−2
)
x
=
6
×
(
−2
)
x
=
2
(9)
−2
:
x
+
3
=
−10
:
25
−10
×
(
x
+
3
)
=
−2
×
25
x
+
3
=
5
x
=
2
(10)
x
−
1
:
10
=
−2
:
−5
−5
×
(
x
−
1
)
=
10
×
(
−2
)
x
−
1
=
4
x
=
5
(11)
x
+
4
:
−4
=
15
:
5
5
×
(
x
+
4
)
=
−4
×
15
x
+
4
=
−12
x
=
−16
(12)
−1
:
−5
=
3
:
x
+
4
−
(
x
+
4
)
=
−5
×
3
x
+
4
=
15
x
=
11
(13)
6
:
2
=
−
x
:
1
2
×
(
−1
)
x
=
6
x
=
−3
(14)
−20
:
5
x
=
1
:
−1
5
x
=
−20
×
(
−1
)
x
=
4
(15)
x
+
2
:
−2
=
−8
:
−4
−4
×
(
x
+
2
)
=
−2
×
(
−8
)
x
+
2
=
−4
x
=
−6
(16)
−4
:
1
=
x
+
5
:
−4
x
+
5
=
−4
×
(
−4
)
x
+
5
=
16
x
=
11