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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
:
−1
=
5
x
:
5
(2)
−5
x
:
−5
=
−2
:
2
(3)
x
−
3
:
−5
=
−3
:
−15
(4)
−3
x
:
18
=
4
:
3
(5)
x
+
2
:
−12
=
5
:
20
(6)
−3
:
1
=
−2
x
:
2
(7)
5
:
4
=
x
−
1
:
16
(8)
−3
:
−15
=
4
:
x
−
5
(9)
−3
:
−6
=
−5
:
x
−
5
(10)
2
:
10
=
5
x
:
125
(11)
4
:
1
=
12
:
x
−
3
(12)
−1
:
−4
=
−4
x
:
−48
(13)
x
+
4
:
4
=
−15
:
20
(14)
−6
:
2
x
=
−15
:
5
(15)
2
x
:
−10
=
25
:
−25
(16)
−3
:
x
−
4
=
2
:
−4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−5
:
−1
=
5
x
:
5
−
5
x
=
−5
×
5
x
=
5
(2)
−5
x
:
−5
=
−2
:
2
2
×
(
−5
)
x
=
−5
×
(
−2
)
x
=
−1
(3)
x
−
3
:
−5
=
−3
:
−15
−15
×
(
x
−
3
)
=
−5
×
(
−3
)
x
−
3
=
−1
x
=
2
(4)
−3
x
:
18
=
4
:
3
3
×
(
−3
)
x
=
18
×
4
x
=
−8
(5)
x
+
2
:
−12
=
5
:
20
20
×
(
x
+
2
)
=
−12
×
5
x
+
2
=
−3
x
=
−5
(6)
−3
:
1
=
−2
x
:
2
−2
x
=
−3
×
2
x
=
3
(7)
5
:
4
=
x
−
1
:
16
4
×
(
x
−
1
)
=
5
×
16
x
−
1
=
20
x
=
21
(8)
−3
:
−15
=
4
:
x
−
5
−3
×
(
x
−
5
)
=
−15
×
4
x
−
5
=
20
x
=
25
(9)
−3
:
−6
=
−5
:
x
−
5
−3
×
(
x
−
5
)
=
−6
×
(
−5
)
x
−
5
=
−10
x
=
−5
(10)
2
:
10
=
5
x
:
125
10
×
5
x
=
2
×
125
x
=
5
(11)
4
:
1
=
12
:
x
−
3
4
×
(
x
−
3
)
=
12
x
−
3
=
3
x
=
6
(12)
−1
:
−4
=
−4
x
:
−48
−4
×
(
−4
)
x
=
−
(
−48
)
x
=
3
(13)
x
+
4
:
4
=
−15
:
20
20
×
(
x
+
4
)
=
4
×
(
−15
)
x
+
4
=
−3
x
=
−7
(14)
−6
:
2
x
=
−15
:
5
−15
×
2
x
=
−6
×
5
x
=
1
(15)
2
x
:
−10
=
25
:
−25
−25
×
2
x
=
−10
×
25
x
=
5
(16)
−3
:
x
−
4
=
2
:
−4
2
×
(
x
−
4
)
=
−3
×
(
−4
)
x
−
4
=
6
x
=
10