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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)
−5
:
5
=
5
x
:
5
(2)
−12
:
−3
x
=
−8
:
2
(3)
−5
:
2
=
15
:
x
+
5
(4)
2
:
−3
=
4
x
:
36
(5)
−4
:
x
−
5
=
4
:
5
(6)
x
−
3
:
4
=
1
:
−1
(7)
4
:
−3
=
5
x
:
15
(8)
x
+
3
:
−3
=
6
:
3
(9)
x
+
2
:
4
=
6
:
−12
(10)
3
:
x
+
3
=
−5
:
20
(11)
6
:
x
+
3
=
15
:
−5
(12)
4
x
:
4
=
−3
:
3
(13)
3
x
:
3
=
4
:
2
(14)
9
:
6
=
x
+
5
:
−2
(15)
−4
:
−12
=
2
x
:
−6
(16)
x
−
2
:
5
=
−16
:
−4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−5
:
5
=
5
x
:
5
5
×
5
x
=
−5
×
5
x
=
−1
(2)
−12
:
−3
x
=
−8
:
2
−8
×
(
−3
)
x
=
−12
×
2
x
=
−1
(3)
−5
:
2
=
15
:
x
+
5
−5
×
(
x
+
5
)
=
2
×
15
x
+
5
=
−6
x
=
−11
(4)
2
:
−3
=
4
x
:
36
−3
×
4
x
=
2
×
36
x
=
−6
(5)
−4
:
x
−
5
=
4
:
5
4
×
(
x
−
5
)
=
−4
×
5
x
−
5
=
−5
x
=
0
(6)
x
−
3
:
4
=
1
:
−1
−
(
x
−
3
)
=
4
x
−
3
=
−4
x
=
−1
(7)
4
:
−3
=
5
x
:
15
−3
×
5
x
=
4
×
15
x
=
−4
(8)
x
+
3
:
−3
=
6
:
3
3
×
(
x
+
3
)
=
−3
×
6
x
+
3
=
−6
x
=
−9
(9)
x
+
2
:
4
=
6
:
−12
−12
×
(
x
+
2
)
=
4
×
6
x
+
2
=
−2
x
=
−4
(10)
3
:
x
+
3
=
−5
:
20
−5
×
(
x
+
3
)
=
3
×
20
x
+
3
=
−12
x
=
−15
(11)
6
:
x
+
3
=
15
:
−5
15
×
(
x
+
3
)
=
6
×
(
−5
)
x
+
3
=
−2
x
=
−5
(12)
4
x
:
4
=
−3
:
3
3
×
4
x
=
4
×
(
−3
)
x
=
−1
(13)
3
x
:
3
=
4
:
2
2
×
3
x
=
3
×
4
x
=
2
(14)
9
:
6
=
x
+
5
:
−2
6
×
(
x
+
5
)
=
9
×
(
−2
)
x
+
5
=
−3
x
=
−8
(15)
−4
:
−12
=
2
x
:
−6
−12
×
2
x
=
−4
×
(
−6
)
x
=
−1
(16)
x
−
2
:
5
=
−16
:
−4
−4
×
(
x
−
2
)
=
5
×
(
−16
)
x
−
2
=
20
x
=
22