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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
:
1
=
−40
:
2
x
(2)
−4
:
16
=
x
+
3
:
−4
(3)
4
:
2
=
−2
x
:
−2
(4)
x
−
3
:
10
=
−1
:
5
(5)
−1
:
−4
=
−15
:
−5
x
(6)
−10
:
2
x
=
−2
:
−10
(7)
4
x
:
−20
=
3
:
5
(8)
12
:
8
=
−3
:
x
+
3
(9)
−4
:
16
=
x
−
4
:
8
(10)
−1
:
−4
=
−4
x
:
32
(11)
2
x
:
−10
=
10
:
25
(12)
−2
x
:
−8
=
3
:
2
(13)
−1
:
5
=
1
:
x
+
2
(14)
−2
:
x
−
5
=
4
:
16
(15)
−4
:
16
=
5
:
x
+
5
(16)
−2
:
−4
=
−5
x
:
50
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
5
:
1
=
−40
:
2
x
5
×
2
x
=
−40
x
=
−4
(2)
−4
:
16
=
x
+
3
:
−4
16
×
(
x
+
3
)
=
−4
×
(
−4
)
x
+
3
=
1
x
=
−2
(3)
4
:
2
=
−2
x
:
−2
2
×
(
−2
)
x
=
4
×
(
−2
)
x
=
2
(4)
x
−
3
:
10
=
−1
:
5
5
×
(
x
−
3
)
=
10
×
(
−1
)
x
−
3
=
−2
x
=
1
(5)
−1
:
−4
=
−15
:
−5
x
−
(
−5
)
x
=
−4
×
(
−15
)
x
=
12
(6)
−10
:
2
x
=
−2
:
−10
−2
×
2
x
=
−10
×
(
−10
)
x
=
−25
(7)
4
x
:
−20
=
3
:
5
5
×
4
x
=
−20
×
3
x
=
−3
(8)
12
:
8
=
−3
:
x
+
3
12
×
(
x
+
3
)
=
8
×
(
−3
)
x
+
3
=
−2
x
=
−5
(9)
−4
:
16
=
x
−
4
:
8
16
×
(
x
−
4
)
=
−4
×
8
x
−
4
=
−2
x
=
2
(10)
−1
:
−4
=
−4
x
:
32
−4
×
(
−4
)
x
=
−
32
x
=
−2
(11)
2
x
:
−10
=
10
:
25
25
×
2
x
=
−10
×
10
x
=
−2
(12)
−2
x
:
−8
=
3
:
2
2
×
(
−2
)
x
=
−8
×
3
x
=
6
(13)
−1
:
5
=
1
:
x
+
2
−
(
x
+
2
)
=
5
x
+
2
=
−5
x
=
−7
(14)
−2
:
x
−
5
=
4
:
16
4
×
(
x
−
5
)
=
−2
×
16
x
−
5
=
−8
x
=
−3
(15)
−4
:
16
=
5
:
x
+
5
−4
×
(
x
+
5
)
=
16
×
5
x
+
5
=
−20
x
=
−25
(16)
−2
:
−4
=
−5
x
:
50
−4
×
(
−5
)
x
=
−2
×
50
x
=
−5