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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
=
4
:
x
+
3
(2)
−4
:
x
+
5
=
−1
:
2
(3)
−16
:
2
x
=
10
:
5
(4)
2
:
−6
=
x
−
2
:
−15
(5)
2
x
:
−8
=
1
:
−2
(6)
−5
:
−1
=
−
x
:
−5
(7)
15
:
−5
x
=
3
:
1
(8)
2
:
1
=
−12
:
−3
x
(9)
5
:
x
−
2
=
−1
:
−3
(10)
−3
x
:
−3
=
−20
:
−5
(11)
1
:
2
=
−
x
:
4
(12)
−3
:
−
x
=
1
:
5
(13)
−3
x
:
−3
=
6
:
−2
(14)
−5
:
3
=
x
−
5
:
6
(15)
−2
x
:
−18
=
−2
:
−3
(16)
1
:
2
=
2
x
:
−4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
:
1
=
4
:
x
+
3
2
×
(
x
+
3
)
=
4
x
+
3
=
2
x
=
−1
(2)
−4
:
x
+
5
=
−1
:
2
−
(
x
+
5
)
=
−4
×
2
x
+
5
=
8
x
=
3
(3)
−16
:
2
x
=
10
:
5
10
×
2
x
=
−16
×
5
x
=
−4
(4)
2
:
−6
=
x
−
2
:
−15
−6
×
(
x
−
2
)
=
2
×
(
−15
)
x
−
2
=
5
x
=
7
(5)
2
x
:
−8
=
1
:
−2
−2
×
2
x
=
−8
x
=
2
(6)
−5
:
−1
=
−
x
:
−5
x
=
−5
×
(
−5
)
x
=
25
(7)
15
:
−5
x
=
3
:
1
3
×
(
−5
)
x
=
15
x
=
−1
(8)
2
:
1
=
−12
:
−3
x
2
×
(
−3
)
x
=
−12
x
=
2
(9)
5
:
x
−
2
=
−1
:
−3
−
(
x
−
2
)
=
5
×
(
−3
)
x
−
2
=
15
x
=
17
(10)
−3
x
:
−3
=
−20
:
−5
−5
×
(
−3
)
x
=
−3
×
(
−20
)
x
=
4
(11)
1
:
2
=
−
x
:
4
2
×
(
−1
)
x
=
4
x
=
−2
(12)
−3
:
−
x
=
1
:
5
−1
x
=
−3
×
5
x
=
15
(13)
−3
x
:
−3
=
6
:
−2
−2
×
(
−3
)
x
=
−3
×
6
x
=
−3
(14)
−5
:
3
=
x
−
5
:
6
3
×
(
x
−
5
)
=
−5
×
6
x
−
5
=
−10
x
=
−5
(15)
−2
x
:
−18
=
−2
:
−3
−3
×
(
−2
)
x
=
−18
×
(
−2
)
x
=
6
(16)
1
:
2
=
2
x
:
−4
2
×
2
x
=
−4
x
=
−1