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©2025 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
:
−1
=
12
:
x
−
2
(2)
−3
:
x
+
5
=
5
:
15
(3)
−2
:
4
=
−3
x
:
−24
(4)
−1
:
3
=
3
x
:
−9
(5)
12
:
−3
x
=
3
:
−12
(6)
3
x
:
48
=
3
:
12
(7)
15
:
x
+
4
=
−10
:
−2
(8)
−3
:
6
=
−1
:
x
−
3
(9)
−4
:
−2
=
x
+
5
:
1
(10)
−2
:
−2
x
=
−2
:
2
(11)
5
x
:
10
=
−20
:
−5
(12)
−16
:
x
+
3
=
4
:
−2
(13)
16
:
4
=
x
−
2
:
−1
(14)
−5
x
:
20
=
10
:
−5
(15)
−2
x
:
10
=
2
:
−2
(16)
−4
:
12
=
−4
:
2
x
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
4
:
−1
=
12
:
x
−
2
4
×
(
x
−
2
)
=
−
12
x
−
2
=
−3
x
=
−1
(2)
−3
:
x
+
5
=
5
:
15
5
×
(
x
+
5
)
=
−3
×
15
x
+
5
=
−9
x
=
−14
(3)
−2
:
4
=
−3
x
:
−24
4
×
(
−3
)
x
=
−2
×
(
−24
)
x
=
−4
(4)
−1
:
3
=
3
x
:
−9
3
×
3
x
=
−
(
−9
)
x
=
1
(5)
12
:
−3
x
=
3
:
−12
3
×
(
−3
)
x
=
12
×
(
−12
)
x
=
16
(6)
3
x
:
48
=
3
:
12
12
×
3
x
=
48
×
3
x
=
4
(7)
15
:
x
+
4
=
−10
:
−2
−10
×
(
x
+
4
)
=
15
×
(
−2
)
x
+
4
=
3
x
=
−1
(8)
−3
:
6
=
−1
:
x
−
3
−3
×
(
x
−
3
)
=
6
×
(
−1
)
x
−
3
=
2
x
=
5
(9)
−4
:
−2
=
x
+
5
:
1
−2
×
(
x
+
5
)
=
−4
x
+
5
=
2
x
=
−3
(10)
−2
:
−2
x
=
−2
:
2
−2
×
(
−2
)
x
=
−2
×
2
x
=
−1
(11)
5
x
:
10
=
−20
:
−5
−5
×
5
x
=
10
×
(
−20
)
x
=
8
(12)
−16
:
x
+
3
=
4
:
−2
4
×
(
x
+
3
)
=
−16
×
(
−2
)
x
+
3
=
8
x
=
5
(13)
16
:
4
=
x
−
2
:
−1
4
×
(
x
−
2
)
=
16
×
(
−1
)
x
−
2
=
−4
x
=
−2
(14)
−5
x
:
20
=
10
:
−5
−5
×
(
−5
)
x
=
20
×
10
x
=
8
(15)
−2
x
:
10
=
2
:
−2
−2
×
(
−2
)
x
=
10
×
2
x
=
5
(16)
−4
:
12
=
−4
:
2
x
−4
×
2
x
=
12
×
(
−4
)
x
=
6