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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)
x
+
4
:
16
=
1
:
4
(2)
4
x
:
20
=
3
:
−1
(3)
12
:
4
x
=
−5
:
−20
(4)
4
:
−4
=
−3
x
:
6
(5)
15
:
x
−
3
=
−5
:
−1
(6)
−36
:
3
x
=
−4
:
−5
(7)
x
−
5
:
2
=
−6
:
3
(8)
−100
:
−4
x
=
5
:
2
(9)
−9
:
15
=
−15
:
−5
x
(10)
2
:
1
=
−4
:
x
−
3
(11)
−2
:
−4
=
8
:
4
x
(12)
1
:
x
−
3
=
−2
:
−4
(13)
−2
:
1
=
−16
:
−4
x
(14)
5
:
−20
=
−
x
:
16
(15)
−60
:
−3
x
=
16
:
4
(16)
3
:
−
x
=
2
:
10
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
+
4
:
16
=
1
:
4
4
×
(
x
+
4
)
=
16
x
+
4
=
4
x
=
0
(2)
4
x
:
20
=
3
:
−1
−
4
x
=
20
×
3
x
=
−15
(3)
12
:
4
x
=
−5
:
−20
−5
×
4
x
=
12
×
(
−20
)
x
=
12
(4)
4
:
−4
=
−3
x
:
6
−4
×
(
−3
)
x
=
4
×
6
x
=
2
(5)
15
:
x
−
3
=
−5
:
−1
−5
×
(
x
−
3
)
=
15
×
(
−1
)
x
−
3
=
3
x
=
6
(6)
−36
:
3
x
=
−4
:
−5
−4
×
3
x
=
−36
×
(
−5
)
x
=
−15
(7)
x
−
5
:
2
=
−6
:
3
3
×
(
x
−
5
)
=
2
×
(
−6
)
x
−
5
=
−4
x
=
1
(8)
−100
:
−4
x
=
5
:
2
5
×
(
−4
)
x
=
−100
×
2
x
=
10
(9)
−9
:
15
=
−15
:
−5
x
−9
×
(
−5
)
x
=
15
×
(
−15
)
x
=
−5
(10)
2
:
1
=
−4
:
x
−
3
2
×
(
x
−
3
)
=
−4
x
−
3
=
−2
x
=
1
(11)
−2
:
−4
=
8
:
4
x
−2
×
4
x
=
−4
×
8
x
=
4
(12)
1
:
x
−
3
=
−2
:
−4
−2
×
(
x
−
3
)
=
−4
x
−
3
=
2
x
=
5
(13)
−2
:
1
=
−16
:
−4
x
−2
×
(
−4
)
x
=
−16
x
=
−2
(14)
5
:
−20
=
−
x
:
16
−20
×
(
−1
)
x
=
5
×
16
x
=
4
(15)
−60
:
−3
x
=
16
:
4
16
×
(
−3
)
x
=
−60
×
4
x
=
5
(16)
3
:
−
x
=
2
:
10
2
×
(
−1
)
x
=
3
×
10
x
=
−15