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