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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
:
4
=
−1
:
x
−
3
(2)
x
+
2
:
1
=
−2
:
−1
(3)
4
:
1
=
16
:
−4
x
(4)
−15
:
−5
x
=
−9
:
12
(5)
3
x
:
6
=
−1
:
−2
(6)
−4
x
:
16
=
−6
:
−2
(7)
x
−
3
:
5
=
8
:
20
(8)
x
+
2
:
−1
=
4
:
−4
(9)
1
:
−1
=
−12
:
−4
x
(10)
48
:
−4
x
=
3
:
−2
(11)
−2
:
x
−
5
=
8
:
−12
(12)
−3
x
:
−27
=
−4
:
12
(13)
−3
:
9
=
1
:
x
−
4
(14)
3
:
−1
=
−48
:
−4
x
(15)
4
:
−4
=
4
:
−4
x
(16)
18
:
3
x
=
15
:
5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
:
4
=
−1
:
x
−
3
2
×
(
x
−
3
)
=
4
×
(
−1
)
x
−
3
=
−2
x
=
1
(2)
x
+
2
:
1
=
−2
:
−1
−
(
x
+
2
)
=
−2
x
+
2
=
2
x
=
0
(3)
4
:
1
=
16
:
−4
x
4
×
(
−4
)
x
=
16
x
=
−1
(4)
−15
:
−5
x
=
−9
:
12
−9
×
(
−5
)
x
=
−15
×
12
x
=
−4
(5)
3
x
:
6
=
−1
:
−2
−2
×
3
x
=
6
×
(
−1
)
x
=
1
(6)
−4
x
:
16
=
−6
:
−2
−2
×
(
−4
)
x
=
16
×
(
−6
)
x
=
−12
(7)
x
−
3
:
5
=
8
:
20
20
×
(
x
−
3
)
=
5
×
8
x
−
3
=
2
x
=
5
(8)
x
+
2
:
−1
=
4
:
−4
−4
×
(
x
+
2
)
=
−
4
x
+
2
=
1
x
=
−1
(9)
1
:
−1
=
−12
:
−4
x
−4
x
=
−
(
−12
)
x
=
−3
(10)
48
:
−4
x
=
3
:
−2
3
×
(
−4
)
x
=
48
×
(
−2
)
x
=
8
(11)
−2
:
x
−
5
=
8
:
−12
8
×
(
x
−
5
)
=
−2
×
(
−12
)
x
−
5
=
3
x
=
8
(12)
−3
x
:
−27
=
−4
:
12
12
×
(
−3
)
x
=
−27
×
(
−4
)
x
=
−3
(13)
−3
:
9
=
1
:
x
−
4
−3
×
(
x
−
4
)
=
9
x
−
4
=
−3
x
=
1
(14)
3
:
−1
=
−48
:
−4
x
3
×
(
−4
)
x
=
−
(
−48
)
x
=
−4
(15)
4
:
−4
=
4
:
−4
x
4
×
(
−4
)
x
=
−4
×
4
x
=
1
(16)
18
:
3
x
=
15
:
5
15
×
3
x
=
18
×
5
x
=
2