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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
x
:
32
=
−4
:
−16
(2)
−16
:
4
=
−100
:
−5
x
(3)
−1
:
3
=
x
+
2
:
−12
(4)
−2
:
−5
=
50
:
−5
x
(5)
10
:
15
=
x
−
5
:
3
(6)
−2
:
3
=
−8
:
x
−
4
(7)
−2
:
2
=
−3
:
−3
x
(8)
−15
:
3
x
=
−1
:
1
(9)
9
:
−3
x
=
1
:
−1
(10)
4
:
−4
=
2
x
:
−24
(11)
5
:
1
=
−20
:
x
−
1
(12)
−5
:
−15
=
12
:
4
x
(13)
20
:
4
x
=
−2
:
2
(14)
−
x
:
−2
=
2
:
1
(15)
10
:
−5
=
x
+
2
:
4
(16)
−4
:
5
=
−24
:
3
x
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
x
:
32
=
−4
:
−16
−16
×
2
x
=
32
×
(
−4
)
x
=
4
(2)
−16
:
4
=
−100
:
−5
x
−16
×
(
−5
)
x
=
4
×
(
−100
)
x
=
−5
(3)
−1
:
3
=
x
+
2
:
−12
3
×
(
x
+
2
)
=
−
(
−12
)
x
+
2
=
4
x
=
2
(4)
−2
:
−5
=
50
:
−5
x
−2
×
(
−5
)
x
=
−5
×
50
x
=
−25
(5)
10
:
15
=
x
−
5
:
3
15
×
(
x
−
5
)
=
10
×
3
x
−
5
=
2
x
=
7
(6)
−2
:
3
=
−8
:
x
−
4
−2
×
(
x
−
4
)
=
3
×
(
−8
)
x
−
4
=
12
x
=
16
(7)
−2
:
2
=
−3
:
−3
x
−2
×
(
−3
)
x
=
2
×
(
−3
)
x
=
−1
(8)
−15
:
3
x
=
−1
:
1
−
3
x
=
−15
x
=
5
(9)
9
:
−3
x
=
1
:
−1
−3
x
=
9
×
(
−1
)
x
=
3
(10)
4
:
−4
=
2
x
:
−24
−4
×
2
x
=
4
×
(
−24
)
x
=
12
(11)
5
:
1
=
−20
:
x
−
1
5
×
(
x
−
1
)
=
−20
x
−
1
=
−4
x
=
−3
(12)
−5
:
−15
=
12
:
4
x
−5
×
4
x
=
−15
×
12
x
=
9
(13)
20
:
4
x
=
−2
:
2
−2
×
4
x
=
20
×
2
x
=
−5
(14)
−
x
:
−2
=
2
:
1
−1
x
=
−2
×
2
x
=
4
(15)
10
:
−5
=
x
+
2
:
4
−5
×
(
x
+
2
)
=
10
×
4
x
+
2
=
−8
x
=
−10
(16)
−4
:
5
=
−24
:
3
x
−4
×
3
x
=
5
×
(
−24
)
x
=
10