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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)
−3
:
−5
=
x
−
5
:
5
(2)
−1
:
−2
=
20
:
5
x
(3)
x
−
1
:
2
=
2
:
1
(4)
20
:
−16
=
x
−
2
:
4
(5)
2
:
10
=
x
+
3
:
−10
(6)
40
:
4
x
=
−5
:
−3
(7)
−2
:
4
=
x
−
3
:
−16
(8)
−25
:
5
=
100
:
5
x
(9)
3
x
:
9
=
−10
:
2
(10)
−
x
:
5
=
2
:
5
(11)
−5
:
−25
=
2
:
−
x
(12)
20
:
−5
x
=
3
:
9
(13)
2
x
:
−2
=
−5
:
1
(14)
−6
:
−3
=
x
−
2
:
2
(15)
−10
:
4
=
−2
x
:
−4
(16)
x
+
2
:
−5
=
−5
:
5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−3
:
−5
=
x
−
5
:
5
−5
×
(
x
−
5
)
=
−3
×
5
x
−
5
=
3
x
=
8
(2)
−1
:
−2
=
20
:
5
x
−
5
x
=
−2
×
20
x
=
8
(3)
x
−
1
:
2
=
2
:
1
x
−
1
=
2
×
2
x
−
1
=
4
x
=
5
(4)
20
:
−16
=
x
−
2
:
4
−16
×
(
x
−
2
)
=
20
×
4
x
−
2
=
−5
x
=
−3
(5)
2
:
10
=
x
+
3
:
−10
10
×
(
x
+
3
)
=
2
×
(
−10
)
x
+
3
=
−2
x
=
−5
(6)
40
:
4
x
=
−5
:
−3
−5
×
4
x
=
40
×
(
−3
)
x
=
6
(7)
−2
:
4
=
x
−
3
:
−16
4
×
(
x
−
3
)
=
−2
×
(
−16
)
x
−
3
=
8
x
=
11
(8)
−25
:
5
=
100
:
5
x
−25
×
5
x
=
5
×
100
x
=
−4
(9)
3
x
:
9
=
−10
:
2
2
×
3
x
=
9
×
(
−10
)
x
=
−15
(10)
−
x
:
5
=
2
:
5
5
×
(
−1
)
x
=
5
×
2
x
=
−2
(11)
−5
:
−25
=
2
:
−
x
−5
×
(
−1
)
x
=
−25
×
2
x
=
−10
(12)
20
:
−5
x
=
3
:
9
3
×
(
−5
)
x
=
20
×
9
x
=
−12
(13)
2
x
:
−2
=
−5
:
1
2
x
=
−2
×
(
−5
)
x
=
5
(14)
−6
:
−3
=
x
−
2
:
2
−3
×
(
x
−
2
)
=
−6
×
2
x
−
2
=
4
x
=
6
(15)
−10
:
4
=
−2
x
:
−4
4
×
(
−2
)
x
=
−10
×
(
−4
)
x
=
−5
(16)
x
+
2
:
−5
=
−5
:
5
5
×
(
x
+
2
)
=
−5
×
(
−5
)
x
+
2
=
5
x
=
3