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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
=
2
:
x
+
4
(2)
−4
:
−20
=
−10
:
2
x
(3)
1
:
5
=
−1
:
x
−
1
(4)
4
:
12
=
4
x
:
−60
(5)
−5
:
x
+
3
=
−1
:
2
(6)
5
:
−3
=
−45
:
3
x
(7)
x
+
3
:
5
=
−6
:
2
(8)
x
+
4
:
5
=
12
:
−15
(9)
x
+
5
:
−3
=
10
:
6
(10)
4
x
:
12
=
−1
:
−3
(11)
−12
:
−3
x
=
16
:
4
(12)
3
:
2
=
12
:
x
−
4
(13)
20
:
5
x
=
−1
:
−4
(14)
12
:
4
=
−9
:
x
+
4
(15)
−4
:
8
=
−2
:
x
+
3
(16)
4
:
−3
=
−16
:
x
+
2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−2
:
1
=
2
:
x
+
4
−2
×
(
x
+
4
)
=
2
x
+
4
=
−1
x
=
−5
(2)
−4
:
−20
=
−10
:
2
x
−4
×
2
x
=
−20
×
(
−10
)
x
=
−25
(3)
1
:
5
=
−1
:
x
−
1
x
−
1
=
5
×
(
−1
)
x
−
1
=
−5
x
=
−4
(4)
4
:
12
=
4
x
:
−60
12
×
4
x
=
4
×
(
−60
)
x
=
−5
(5)
−5
:
x
+
3
=
−1
:
2
−
(
x
+
3
)
=
−5
×
2
x
+
3
=
10
x
=
7
(6)
5
:
−3
=
−45
:
3
x
5
×
3
x
=
−3
×
(
−45
)
x
=
9
(7)
x
+
3
:
5
=
−6
:
2
2
×
(
x
+
3
)
=
5
×
(
−6
)
x
+
3
=
−15
x
=
−18
(8)
x
+
4
:
5
=
12
:
−15
−15
×
(
x
+
4
)
=
5
×
12
x
+
4
=
−4
x
=
−8
(9)
x
+
5
:
−3
=
10
:
6
6
×
(
x
+
5
)
=
−3
×
10
x
+
5
=
−5
x
=
−10
(10)
4
x
:
12
=
−1
:
−3
−3
×
4
x
=
12
×
(
−1
)
x
=
1
(11)
−12
:
−3
x
=
16
:
4
16
×
(
−3
)
x
=
−12
×
4
x
=
1
(12)
3
:
2
=
12
:
x
−
4
3
×
(
x
−
4
)
=
2
×
12
x
−
4
=
8
x
=
12
(13)
20
:
5
x
=
−1
:
−4
−
5
x
=
20
×
(
−4
)
x
=
16
(14)
12
:
4
=
−9
:
x
+
4
12
×
(
x
+
4
)
=
4
×
(
−9
)
x
+
4
=
−3
x
=
−7
(15)
−4
:
8
=
−2
:
x
+
3
−4
×
(
x
+
3
)
=
8
×
(
−2
)
x
+
3
=
4
x
=
1
(16)
4
:
−3
=
−16
:
x
+
2
4
×
(
x
+
2
)
=
−3
×
(
−16
)
x
+
2
=
12
x
=
10