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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
:
2
=
3
:
−3
x
(2)
−2
:
x
+
4
=
−4
:
2
(3)
4
:
x
−
4
=
2
:
−3
(4)
−4
:
−12
=
5
:
x
+
3
(5)
−3
:
x
+
5
=
−4
:
4
(6)
1
:
3
=
−1
:
x
−
4
(7)
2
:
x
−
2
=
−2
:
3
(8)
x
+
4
:
−3
=
−15
:
15
(9)
x
−
4
:
−4
=
6
:
8
(10)
−30
:
−2
x
=
−12
:
−4
(11)
−5
x
:
25
=
−2
:
−1
(12)
−5
:
−4
=
40
:
−2
x
(13)
−5
x
:
−10
=
−1
:
−2
(14)
1
:
−1
=
5
:
x
−
3
(15)
5
:
10
=
−15
:
−5
x
(16)
−15
:
3
=
100
:
4
x
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−2
:
2
=
3
:
−3
x
−2
×
(
−3
)
x
=
2
×
3
x
=
1
(2)
−2
:
x
+
4
=
−4
:
2
−4
×
(
x
+
4
)
=
−2
×
2
x
+
4
=
1
x
=
−3
(3)
4
:
x
−
4
=
2
:
−3
2
×
(
x
−
4
)
=
4
×
(
−3
)
x
−
4
=
−6
x
=
−2
(4)
−4
:
−12
=
5
:
x
+
3
−4
×
(
x
+
3
)
=
−12
×
5
x
+
3
=
15
x
=
12
(5)
−3
:
x
+
5
=
−4
:
4
−4
×
(
x
+
5
)
=
−3
×
4
x
+
5
=
3
x
=
−2
(6)
1
:
3
=
−1
:
x
−
4
x
−
4
=
3
×
(
−1
)
x
−
4
=
−3
x
=
1
(7)
2
:
x
−
2
=
−2
:
3
−2
×
(
x
−
2
)
=
2
×
3
x
−
2
=
−3
x
=
−1
(8)
x
+
4
:
−3
=
−15
:
15
15
×
(
x
+
4
)
=
−3
×
(
−15
)
x
+
4
=
3
x
=
−1
(9)
x
−
4
:
−4
=
6
:
8
8
×
(
x
−
4
)
=
−4
×
6
x
−
4
=
−3
x
=
1
(10)
−30
:
−2
x
=
−12
:
−4
−12
×
(
−2
)
x
=
−30
×
(
−4
)
x
=
5
(11)
−5
x
:
25
=
−2
:
−1
−
(
−5
)
x
=
25
×
(
−2
)
x
=
−10
(12)
−5
:
−4
=
40
:
−2
x
−5
×
(
−2
)
x
=
−4
×
40
x
=
−16
(13)
−5
x
:
−10
=
−1
:
−2
−2
×
(
−5
)
x
=
−10
×
(
−1
)
x
=
1
(14)
1
:
−1
=
5
:
x
−
3
x
−
3
=
−
5
x
−
3
=
−5
x
=
−2
(15)
5
:
10
=
−15
:
−5
x
5
×
(
−5
)
x
=
10
×
(
−15
)
x
=
6
(16)
−15
:
3
=
100
:
4
x
−15
×
4
x
=
3
×
100
x
=
−5