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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)
−2
:
2
=
4
x
:
4
(2)
10
:
5
x
=
−3
:
6
(3)
x
+
5
:
−20
=
5
:
−4
(4)
3
:
−2
=
−4
x
:
−8
(5)
x
−
4
:
10
=
−4
:
8
(6)
−5
:
−25
=
−5
x
:
−50
(7)
4
:
x
−
5
=
3
:
−3
(8)
−4
x
:
80
=
5
:
25
(9)
15
:
−25
=
x
−
5
:
5
(10)
−3
:
−
x
=
6
:
8
(11)
4
:
2
x
=
−5
:
−20
(12)
−2
x
:
16
=
1
:
4
(13)
3
:
x
+
4
=
6
:
−10
(14)
2
:
x
−
3
=
−4
:
6
(15)
−5
:
1
=
50
:
−2
x
(16)
−4
:
2
x
=
6
:
−3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−2
:
2
=
4
x
:
4
2
×
4
x
=
−2
×
4
x
=
−1
(2)
10
:
5
x
=
−3
:
6
−3
×
5
x
=
10
×
6
x
=
−4
(3)
x
+
5
:
−20
=
5
:
−4
−4
×
(
x
+
5
)
=
−20
×
5
x
+
5
=
25
x
=
20
(4)
3
:
−2
=
−4
x
:
−8
−2
×
(
−4
)
x
=
3
×
(
−8
)
x
=
−3
(5)
x
−
4
:
10
=
−4
:
8
8
×
(
x
−
4
)
=
10
×
(
−4
)
x
−
4
=
−5
x
=
−1
(6)
−5
:
−25
=
−5
x
:
−50
−25
×
(
−5
)
x
=
−5
×
(
−50
)
x
=
2
(7)
4
:
x
−
5
=
3
:
−3
3
×
(
x
−
5
)
=
4
×
(
−3
)
x
−
5
=
−4
x
=
1
(8)
−4
x
:
80
=
5
:
25
25
×
(
−4
)
x
=
80
×
5
x
=
−4
(9)
15
:
−25
=
x
−
5
:
5
−25
×
(
x
−
5
)
=
15
×
5
x
−
5
=
−3
x
=
2
(10)
−3
:
−
x
=
6
:
8
6
×
(
−1
)
x
=
−3
×
8
x
=
4
(11)
4
:
2
x
=
−5
:
−20
−5
×
2
x
=
4
×
(
−20
)
x
=
8
(12)
−2
x
:
16
=
1
:
4
4
×
(
−2
)
x
=
16
x
=
−2
(13)
3
:
x
+
4
=
6
:
−10
6
×
(
x
+
4
)
=
3
×
(
−10
)
x
+
4
=
−5
x
=
−9
(14)
2
:
x
−
3
=
−4
:
6
−4
×
(
x
−
3
)
=
2
×
6
x
−
3
=
−3
x
=
0
(15)
−5
:
1
=
50
:
−2
x
−5
×
(
−2
)
x
=
50
x
=
5
(16)
−4
:
2
x
=
6
:
−3
6
×
2
x
=
−4
×
(
−3
)
x
=
1