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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
:
5
=
4
:
−
x
(2)
4
:
−4
=
16
:
x
+
4
(3)
−4
x
:
4
=
−25
:
5
(4)
8
:
16
=
−5
x
:
20
(5)
−5
:
3
=
x
−
2
:
12
(6)
x
+
5
:
−20
=
−2
:
4
(7)
x
−
4
:
3
=
−8
:
−2
(8)
40
:
−2
x
=
4
:
−5
(9)
1
:
4
=
−5
:
5
x
(10)
1
:
2
=
−4
x
:
16
(11)
−10
:
2
x
=
3
:
12
(12)
−4
:
−1
=
5
x
:
15
(13)
2
:
x
−
3
=
−4
:
4
(14)
x
−
5
:
1
=
−5
:
−1
(15)
−3
:
4
=
5
x
:
40
(16)
75
:
5
x
=
−5
:
−4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
10
:
5
=
4
:
−
x
10
×
(
−1
)
x
=
5
×
4
x
=
−2
(2)
4
:
−4
=
16
:
x
+
4
4
×
(
x
+
4
)
=
−4
×
16
x
+
4
=
−16
x
=
−20
(3)
−4
x
:
4
=
−25
:
5
5
×
(
−4
)
x
=
4
×
(
−25
)
x
=
5
(4)
8
:
16
=
−5
x
:
20
16
×
(
−5
)
x
=
8
×
20
x
=
−2
(5)
−5
:
3
=
x
−
2
:
12
3
×
(
x
−
2
)
=
−5
×
12
x
−
2
=
−20
x
=
−18
(6)
x
+
5
:
−20
=
−2
:
4
4
×
(
x
+
5
)
=
−20
×
(
−2
)
x
+
5
=
10
x
=
5
(7)
x
−
4
:
3
=
−8
:
−2
−2
×
(
x
−
4
)
=
3
×
(
−8
)
x
−
4
=
12
x
=
16
(8)
40
:
−2
x
=
4
:
−5
4
×
(
−2
)
x
=
40
×
(
−5
)
x
=
25
(9)
1
:
4
=
−5
:
5
x
5
x
=
4
×
(
−5
)
x
=
−4
(10)
1
:
2
=
−4
x
:
16
2
×
(
−4
)
x
=
16
x
=
−2
(11)
−10
:
2
x
=
3
:
12
3
×
2
x
=
−10
×
12
x
=
−20
(12)
−4
:
−1
=
5
x
:
15
−
5
x
=
−4
×
15
x
=
12
(13)
2
:
x
−
3
=
−4
:
4
−4
×
(
x
−
3
)
=
2
×
4
x
−
3
=
−2
x
=
1
(14)
x
−
5
:
1
=
−5
:
−1
−
(
x
−
5
)
=
−5
x
−
5
=
5
x
=
10
(15)
−3
:
4
=
5
x
:
40
4
×
5
x
=
−3
×
40
x
=
−6
(16)
75
:
5
x
=
−5
:
−4
−5
×
5
x
=
75
×
(
−4
)
x
=
12