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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
=
x
+
2
:
−2
(2)
5
:
15
=
x
−
1
:
−15
(3)
−5
:
−3
=
−5
x
:
−75
(4)
−5
:
−15
=
−
x
:
−3
(5)
−2
:
2
=
x
−
1
:
−3
(6)
−2
:
x
+
3
=
1
:
−4
(7)
−4
:
−16
=
4
x
:
−16
(8)
−1
:
2
=
x
−
5
:
−10
(9)
5
:
−2
=
2
x
:
12
(10)
−2
:
−
x
=
1
:
−2
(11)
x
+
2
:
2
=
−4
:
−1
(12)
−27
:
−3
x
=
−3
:
−1
(13)
−
x
:
−4
=
−3
:
12
(14)
−2
:
x
+
5
=
−8
:
12
(15)
−5
x
:
−40
=
5
:
−20
(16)
−4
:
x
−
2
=
12
:
−3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
:
1
=
x
+
2
:
−2
x
+
2
=
2
×
(
−2
)
x
+
2
=
−4
x
=
−6
(2)
5
:
15
=
x
−
1
:
−15
15
×
(
x
−
1
)
=
5
×
(
−15
)
x
−
1
=
−5
x
=
−4
(3)
−5
:
−3
=
−5
x
:
−75
−3
×
(
−5
)
x
=
−5
×
(
−75
)
x
=
25
(4)
−5
:
−15
=
−
x
:
−3
−15
×
(
−1
)
x
=
−5
×
(
−3
)
x
=
1
(5)
−2
:
2
=
x
−
1
:
−3
2
×
(
x
−
1
)
=
−2
×
(
−3
)
x
−
1
=
3
x
=
4
(6)
−2
:
x
+
3
=
1
:
−4
x
+
3
=
−2
×
(
−4
)
x
+
3
=
8
x
=
5
(7)
−4
:
−16
=
4
x
:
−16
−16
×
4
x
=
−4
×
(
−16
)
x
=
−1
(8)
−1
:
2
=
x
−
5
:
−10
2
×
(
x
−
5
)
=
−
(
−10
)
x
−
5
=
5
x
=
10
(9)
5
:
−2
=
2
x
:
12
−2
×
2
x
=
5
×
12
x
=
−15
(10)
−2
:
−
x
=
1
:
−2
−1
x
=
−2
×
(
−2
)
x
=
−4
(11)
x
+
2
:
2
=
−4
:
−1
−
(
x
+
2
)
=
2
×
(
−4
)
x
+
2
=
8
x
=
6
(12)
−27
:
−3
x
=
−3
:
−1
−3
×
(
−3
)
x
=
−27
×
(
−1
)
x
=
3
(13)
−
x
:
−4
=
−3
:
12
12
×
(
−1
)
x
=
−4
×
(
−3
)
x
=
−1
(14)
−2
:
x
+
5
=
−8
:
12
−8
×
(
x
+
5
)
=
−2
×
12
x
+
5
=
3
x
=
−2
(15)
−5
x
:
−40
=
5
:
−20
−20
×
(
−5
)
x
=
−40
×
5
x
=
−2
(16)
−4
:
x
−
2
=
12
:
−3
12
×
(
x
−
2
)
=
−4
×
(
−3
)
x
−
2
=
1
x
=
3