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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)
1
:
4
=
−1
:
x
+
2
(2)
−2
:
x
−
4
=
−4
:
−2
(3)
2
:
−4
=
2
x
:
8
(4)
4
x
:
−48
=
−3
:
3
(5)
4
:
x
−
2
=
−12
:
3
(6)
4
:
3
=
3
x
:
−9
(7)
4
:
−12
=
3
:
3
x
(8)
−5
:
2
=
−25
:
x
+
5
(9)
−4
:
−16
=
−2
:
x
−
5
(10)
6
:
−2
x
=
15
:
20
(11)
9
:
3
x
=
−9
:
−3
(12)
2
:
4
=
−2
x
:
−4
(13)
4
x
:
−12
=
−20
:
4
(14)
−
x
:
6
=
1
:
3
(15)
−5
x
:
−40
=
−2
:
4
(16)
−3
:
−4
=
x
+
5
:
16
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
1
:
4
=
−1
:
x
+
2
x
+
2
=
4
×
(
−1
)
x
+
2
=
−4
x
=
−6
(2)
−2
:
x
−
4
=
−4
:
−2
−4
×
(
x
−
4
)
=
−2
×
(
−2
)
x
−
4
=
−1
x
=
3
(3)
2
:
−4
=
2
x
:
8
−4
×
2
x
=
2
×
8
x
=
−2
(4)
4
x
:
−48
=
−3
:
3
3
×
4
x
=
−48
×
(
−3
)
x
=
12
(5)
4
:
x
−
2
=
−12
:
3
−12
×
(
x
−
2
)
=
4
×
3
x
−
2
=
−1
x
=
1
(6)
4
:
3
=
3
x
:
−9
3
×
3
x
=
4
×
(
−9
)
x
=
−4
(7)
4
:
−12
=
3
:
3
x
4
×
3
x
=
−12
×
3
x
=
−3
(8)
−5
:
2
=
−25
:
x
+
5
−5
×
(
x
+
5
)
=
2
×
(
−25
)
x
+
5
=
10
x
=
5
(9)
−4
:
−16
=
−2
:
x
−
5
−4
×
(
x
−
5
)
=
−16
×
(
−2
)
x
−
5
=
−8
x
=
−3
(10)
6
:
−2
x
=
15
:
20
15
×
(
−2
)
x
=
6
×
20
x
=
−4
(11)
9
:
3
x
=
−9
:
−3
−9
×
3
x
=
9
×
(
−3
)
x
=
1
(12)
2
:
4
=
−2
x
:
−4
4
×
(
−2
)
x
=
2
×
(
−4
)
x
=
1
(13)
4
x
:
−12
=
−20
:
4
4
×
4
x
=
−12
×
(
−20
)
x
=
15
(14)
−
x
:
6
=
1
:
3
3
×
(
−1
)
x
=
6
x
=
−2
(15)
−5
x
:
−40
=
−2
:
4
4
×
(
−5
)
x
=
−40
×
(
−2
)
x
=
−4
(16)
−3
:
−4
=
x
+
5
:
16
−4
×
(
x
+
5
)
=
−3
×
16
x
+
5
=
12
x
=
7