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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)
10
:
−2
=
5
:
x
−
2
(2)
4
:
2
=
−12
:
2
x
(3)
x
−
3
:
−10
=
−3
:
2
(4)
2
x
:
24
=
−1
:
−3
(5)
5
:
5
x
=
2
:
−4
(6)
−3
:
−1
=
−24
:
−4
x
(7)
−1
:
−5
=
x
−
4
:
10
(8)
−2
x
:
32
=
−3
:
−4
(9)
−12
:
x
+
4
=
−3
:
−5
(10)
−3
:
−15
=
−5
:
x
+
5
(11)
x
−
5
:
5
=
−5
:
25
(12)
−1
:
−2
=
5
:
x
+
5
(13)
6
:
−12
=
−2
:
x
−
2
(14)
4
x
:
36
=
−2
:
3
(15)
−3
:
x
−
3
=
2
:
−8
(16)
−2
x
:
32
=
3
:
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
10
:
−2
=
5
:
x
−
2
10
×
(
x
−
2
)
=
−2
×
5
x
−
2
=
−1
x
=
1
(2)
4
:
2
=
−12
:
2
x
4
×
2
x
=
2
×
(
−12
)
x
=
−3
(3)
x
−
3
:
−10
=
−3
:
2
2
×
(
x
−
3
)
=
−10
×
(
−3
)
x
−
3
=
15
x
=
18
(4)
2
x
:
24
=
−1
:
−3
−3
×
2
x
=
24
×
(
−1
)
x
=
4
(5)
5
:
5
x
=
2
:
−4
2
×
5
x
=
5
×
(
−4
)
x
=
−2
(6)
−3
:
−1
=
−24
:
−4
x
−3
×
(
−4
)
x
=
−
(
−24
)
x
=
2
(7)
−1
:
−5
=
x
−
4
:
10
−5
×
(
x
−
4
)
=
−
10
x
−
4
=
2
x
=
6
(8)
−2
x
:
32
=
−3
:
−4
−4
×
(
−2
)
x
=
32
×
(
−3
)
x
=
−12
(9)
−12
:
x
+
4
=
−3
:
−5
−3
×
(
x
+
4
)
=
−12
×
(
−5
)
x
+
4
=
−20
x
=
−24
(10)
−3
:
−15
=
−5
:
x
+
5
−3
×
(
x
+
5
)
=
−15
×
(
−5
)
x
+
5
=
−25
x
=
−30
(11)
x
−
5
:
5
=
−5
:
25
25
×
(
x
−
5
)
=
5
×
(
−5
)
x
−
5
=
−1
x
=
4
(12)
−1
:
−2
=
5
:
x
+
5
−
(
x
+
5
)
=
−2
×
5
x
+
5
=
10
x
=
5
(13)
6
:
−12
=
−2
:
x
−
2
6
×
(
x
−
2
)
=
−12
×
(
−2
)
x
−
2
=
4
x
=
6
(14)
4
x
:
36
=
−2
:
3
3
×
4
x
=
36
×
(
−2
)
x
=
−6
(15)
−3
:
x
−
3
=
2
:
−8
2
×
(
x
−
3
)
=
−3
×
(
−8
)
x
−
3
=
12
x
=
15
(16)
−2
x
:
32
=
3
:
4
4
×
(
−2
)
x
=
32
×
3
x
=
−12