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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
:
4
=
3
x
:
30
(2)
x
−
5
:
5
=
−1
:
1
(3)
−
x
:
−1
=
−2
:
−1
(4)
16
:
20
=
4
:
x
−
5
(5)
4
:
−3
=
32
:
4
x
(6)
16
:
2
x
=
−4
:
−1
(7)
−45
:
−3
x
=
−5
:
5
(8)
x
−
2
:
2
=
2
:
4
(9)
4
:
−4
=
−4
x
:
−48
(10)
2
:
x
+
5
=
−6
:
−15
(11)
−5
:
−4
=
2
x
:
8
(12)
3
:
−5
=
2
x
:
10
(13)
2
:
1
=
8
:
−2
x
(14)
−2
:
x
−
2
=
2
:
−5
(15)
−5
x
:
−100
=
1
:
−5
(16)
−1
:
5
=
−2
:
x
−
2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−2
:
4
=
3
x
:
30
4
×
3
x
=
−2
×
30
x
=
−5
(2)
x
−
5
:
5
=
−1
:
1
x
−
5
=
5
×
(
−1
)
x
−
5
=
−5
x
=
0
(3)
−
x
:
−1
=
−2
:
−1
x
=
−
(
−2
)
x
=
2
(4)
16
:
20
=
4
:
x
−
5
16
×
(
x
−
5
)
=
20
×
4
x
−
5
=
5
x
=
10
(5)
4
:
−3
=
32
:
4
x
4
×
4
x
=
−3
×
32
x
=
−6
(6)
16
:
2
x
=
−4
:
−1
−4
×
2
x
=
16
×
(
−1
)
x
=
2
(7)
−45
:
−3
x
=
−5
:
5
−5
×
(
−3
)
x
=
−45
×
5
x
=
−15
(8)
x
−
2
:
2
=
2
:
4
4
×
(
x
−
2
)
=
2
×
2
x
−
2
=
1
x
=
3
(9)
4
:
−4
=
−4
x
:
−48
−4
×
(
−4
)
x
=
4
×
(
−48
)
x
=
−12
(10)
2
:
x
+
5
=
−6
:
−15
−6
×
(
x
+
5
)
=
2
×
(
−15
)
x
+
5
=
5
x
=
0
(11)
−5
:
−4
=
2
x
:
8
−4
×
2
x
=
−5
×
8
x
=
5
(12)
3
:
−5
=
2
x
:
10
−5
×
2
x
=
3
×
10
x
=
−3
(13)
2
:
1
=
8
:
−2
x
2
×
(
−2
)
x
=
8
x
=
−2
(14)
−2
:
x
−
2
=
2
:
−5
2
×
(
x
−
2
)
=
−2
×
(
−5
)
x
−
2
=
5
x
=
7
(15)
−5
x
:
−100
=
1
:
−5
−5
×
(
−5
)
x
=
−100
x
=
−4
(16)
−1
:
5
=
−2
:
x
−
2
−
(
x
−
2
)
=
5
×
(
−2
)
x
−
2
=
10
x
=
12