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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
−
2
=
10
:
−2
(2)
12
:
3
=
16
:
−4
x
(3)
48
:
−4
x
=
4
:
3
(4)
−2
:
x
+
3
=
4
:
−12
(5)
−10
:
−2
=
x
+
2
:
−4
(6)
x
−
5
:
−5
=
−2
:
5
(7)
−5
:
−15
=
x
+
4
:
−9
(8)
x
+
2
:
−3
=
20
:
5
(9)
−8
:
20
=
−2
:
x
−
2
(10)
−2
:
1
=
−10
:
x
−
5
(11)
8
:
−4
=
−24
:
3
x
(12)
20
:
x
+
5
=
−5
:
−3
(13)
−1
:
x
+
3
=
1
:
3
(14)
4
:
x
+
2
=
5
:
−25
(15)
−2
:
x
+
2
=
−4
:
2
(16)
−4
:
−8
=
−8
:
4
x
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
5
:
x
−
2
=
10
:
−2
10
×
(
x
−
2
)
=
5
×
(
−2
)
x
−
2
=
−1
x
=
1
(2)
12
:
3
=
16
:
−4
x
12
×
(
−4
)
x
=
3
×
16
x
=
−1
(3)
48
:
−4
x
=
4
:
3
4
×
(
−4
)
x
=
48
×
3
x
=
−9
(4)
−2
:
x
+
3
=
4
:
−12
4
×
(
x
+
3
)
=
−2
×
(
−12
)
x
+
3
=
6
x
=
3
(5)
−10
:
−2
=
x
+
2
:
−4
−2
×
(
x
+
2
)
=
−10
×
(
−4
)
x
+
2
=
−20
x
=
−22
(6)
x
−
5
:
−5
=
−2
:
5
5
×
(
x
−
5
)
=
−5
×
(
−2
)
x
−
5
=
2
x
=
7
(7)
−5
:
−15
=
x
+
4
:
−9
−15
×
(
x
+
4
)
=
−5
×
(
−9
)
x
+
4
=
−3
x
=
−7
(8)
x
+
2
:
−3
=
20
:
5
5
×
(
x
+
2
)
=
−3
×
20
x
+
2
=
−12
x
=
−14
(9)
−8
:
20
=
−2
:
x
−
2
−8
×
(
x
−
2
)
=
20
×
(
−2
)
x
−
2
=
5
x
=
7
(10)
−2
:
1
=
−10
:
x
−
5
−2
×
(
x
−
5
)
=
−10
x
−
5
=
5
x
=
10
(11)
8
:
−4
=
−24
:
3
x
8
×
3
x
=
−4
×
(
−24
)
x
=
4
(12)
20
:
x
+
5
=
−5
:
−3
−5
×
(
x
+
5
)
=
20
×
(
−3
)
x
+
5
=
12
x
=
7
(13)
−1
:
x
+
3
=
1
:
3
x
+
3
=
−
3
x
+
3
=
−3
x
=
−6
(14)
4
:
x
+
2
=
5
:
−25
5
×
(
x
+
2
)
=
4
×
(
−25
)
x
+
2
=
−20
x
=
−22
(15)
−2
:
x
+
2
=
−4
:
2
−4
×
(
x
+
2
)
=
−2
×
2
x
+
2
=
1
x
=
−1
(16)
−4
:
−8
=
−8
:
4
x
−4
×
4
x
=
−8
×
(
−8
)
x
=
−4