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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
:
1
=
8
:
x
+
5
(2)
x
−
2
:
−5
=
4
:
10
(3)
4
x
:
−20
=
−6
:
−2
(4)
25
:
−20
=
4
x
:
16
(5)
−10
:
x
+
3
=
6
:
−3
(6)
−
x
:
−2
=
5
:
−2
(7)
4
x
:
−20
=
6
:
−15
(8)
1
:
x
−
1
=
−3
:
3
(9)
x
−
3
:
−16
=
−5
:
20
(10)
−2
:
1
=
30
:
−3
x
(11)
−2
:
x
+
2
=
2
:
−1
(12)
−3
:
3
=
−5
x
:
−5
(13)
−1
:
−4
=
−4
x
:
−48
(14)
4
:
8
=
4
x
:
−40
(15)
x
−
5
:
−3
=
5
:
15
(16)
−8
:
16
=
6
:
−3
x
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−2
:
1
=
8
:
x
+
5
−2
×
(
x
+
5
)
=
8
x
+
5
=
−4
x
=
−9
(2)
x
−
2
:
−5
=
4
:
10
10
×
(
x
−
2
)
=
−5
×
4
x
−
2
=
−2
x
=
0
(3)
4
x
:
−20
=
−6
:
−2
−2
×
4
x
=
−20
×
(
−6
)
x
=
−15
(4)
25
:
−20
=
4
x
:
16
−20
×
4
x
=
25
×
16
x
=
−5
(5)
−10
:
x
+
3
=
6
:
−3
6
×
(
x
+
3
)
=
−10
×
(
−3
)
x
+
3
=
5
x
=
2
(6)
−
x
:
−2
=
5
:
−2
−2
×
(
−1
)
x
=
−2
×
5
x
=
−5
(7)
4
x
:
−20
=
6
:
−15
−15
×
4
x
=
−20
×
6
x
=
2
(8)
1
:
x
−
1
=
−3
:
3
−3
×
(
x
−
1
)
=
3
x
−
1
=
−1
x
=
0
(9)
x
−
3
:
−16
=
−5
:
20
20
×
(
x
−
3
)
=
−16
×
(
−5
)
x
−
3
=
4
x
=
7
(10)
−2
:
1
=
30
:
−3
x
−2
×
(
−3
)
x
=
30
x
=
5
(11)
−2
:
x
+
2
=
2
:
−1
2
×
(
x
+
2
)
=
−2
×
(
−1
)
x
+
2
=
1
x
=
−1
(12)
−3
:
3
=
−5
x
:
−5
3
×
(
−5
)
x
=
−3
×
(
−5
)
x
=
−1
(13)
−1
:
−4
=
−4
x
:
−48
−4
×
(
−4
)
x
=
−
(
−48
)
x
=
3
(14)
4
:
8
=
4
x
:
−40
8
×
4
x
=
4
×
(
−40
)
x
=
−5
(15)
x
−
5
:
−3
=
5
:
15
15
×
(
x
−
5
)
=
−3
×
5
x
−
5
=
−1
x
=
4
(16)
−8
:
16
=
6
:
−3
x
−8
×
(
−3
)
x
=
16
×
6
x
=
4