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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)
1
:
2
=
2
:
−2
x
(2)
−16
:
8
=
−8
:
−2
x
(3)
−3
:
−12
=
4
x
:
64
(4)
−2
:
1
=
8
:
−2
x
(5)
10
:
−2
=
−75
:
−5
x
(6)
x
−
5
:
4
=
−12
:
3
(7)
15
:
−9
=
15
:
−3
x
(8)
−8
:
2
=
−20
:
x
−
1
(9)
16
:
4
=
x
+
3
:
−5
(10)
x
+
3
:
25
=
2
:
−10
(11)
9
:
15
=
x
−
4
:
−5
(12)
−9
:
15
=
x
−
1
:
5
(13)
15
:
x
+
3
=
−5
:
−4
(14)
4
:
−1
=
−32
:
−2
x
(15)
−8
:
2
=
x
+
3
:
3
(16)
9
:
3
=
−4
x
:
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
1
:
2
=
2
:
−2
x
−2
x
=
2
×
2
x
=
−2
(2)
−16
:
8
=
−8
:
−2
x
−16
×
(
−2
)
x
=
8
×
(
−8
)
x
=
−2
(3)
−3
:
−12
=
4
x
:
64
−12
×
4
x
=
−3
×
64
x
=
4
(4)
−2
:
1
=
8
:
−2
x
−2
×
(
−2
)
x
=
8
x
=
2
(5)
10
:
−2
=
−75
:
−5
x
10
×
(
−5
)
x
=
−2
×
(
−75
)
x
=
−3
(6)
x
−
5
:
4
=
−12
:
3
3
×
(
x
−
5
)
=
4
×
(
−12
)
x
−
5
=
−16
x
=
−11
(7)
15
:
−9
=
15
:
−3
x
15
×
(
−3
)
x
=
−9
×
15
x
=
3
(8)
−8
:
2
=
−20
:
x
−
1
−8
×
(
x
−
1
)
=
2
×
(
−20
)
x
−
1
=
5
x
=
6
(9)
16
:
4
=
x
+
3
:
−5
4
×
(
x
+
3
)
=
16
×
(
−5
)
x
+
3
=
−20
x
=
−23
(10)
x
+
3
:
25
=
2
:
−10
−10
×
(
x
+
3
)
=
25
×
2
x
+
3
=
−5
x
=
−8
(11)
9
:
15
=
x
−
4
:
−5
15
×
(
x
−
4
)
=
9
×
(
−5
)
x
−
4
=
−3
x
=
1
(12)
−9
:
15
=
x
−
1
:
5
15
×
(
x
−
1
)
=
−9
×
5
x
−
1
=
−3
x
=
−2
(13)
15
:
x
+
3
=
−5
:
−4
−5
×
(
x
+
3
)
=
15
×
(
−4
)
x
+
3
=
12
x
=
9
(14)
4
:
−1
=
−32
:
−2
x
4
×
(
−2
)
x
=
−
(
−32
)
x
=
−4
(15)
−8
:
2
=
x
+
3
:
3
2
×
(
x
+
3
)
=
−8
×
3
x
+
3
=
−12
x
=
−15
(16)
9
:
3
=
−4
x
:
4
3
×
(
−4
)
x
=
9
×
4
x
=
−3