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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)
−10
:
25
=
x
−
1
:
5
(2)
−4
:
−2
=
−8
:
−4
x
(3)
1
:
x
+
2
=
3
:
−3
(4)
−4
:
x
−
3
=
−12
:
−3
(5)
−4
x
:
−16
=
−5
:
−4
(6)
3
:
−3
=
x
−
4
:
5
(7)
−2
:
6
=
5
x
:
−15
(8)
2
:
−1
=
8
:
x
+
4
(9)
−2
:
−4
=
6
:
−
x
(10)
−5
x
:
125
=
−4
:
−5
(11)
−4
:
6
=
2
x
:
−6
(12)
−8
:
−4
x
=
−1
:
3
(13)
−2
:
3
=
−3
x
:
36
(14)
−12
:
3
=
4
x
:
−4
(15)
−6
:
−4
=
−3
:
x
−
3
(16)
5
x
:
10
=
2
:
1
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−10
:
25
=
x
−
1
:
5
25
×
(
x
−
1
)
=
−10
×
5
x
−
1
=
−2
x
=
−1
(2)
−4
:
−2
=
−8
:
−4
x
−4
×
(
−4
)
x
=
−2
×
(
−8
)
x
=
1
(3)
1
:
x
+
2
=
3
:
−3
3
×
(
x
+
2
)
=
−3
x
+
2
=
−1
x
=
−3
(4)
−4
:
x
−
3
=
−12
:
−3
−12
×
(
x
−
3
)
=
−4
×
(
−3
)
x
−
3
=
−1
x
=
2
(5)
−4
x
:
−16
=
−5
:
−4
−4
×
(
−4
)
x
=
−16
×
(
−5
)
x
=
5
(6)
3
:
−3
=
x
−
4
:
5
−3
×
(
x
−
4
)
=
3
×
5
x
−
4
=
−5
x
=
−1
(7)
−2
:
6
=
5
x
:
−15
6
×
5
x
=
−2
×
(
−15
)
x
=
1
(8)
2
:
−1
=
8
:
x
+
4
2
×
(
x
+
4
)
=
−
8
x
+
4
=
−4
x
=
−8
(9)
−2
:
−4
=
6
:
−
x
−2
×
(
−1
)
x
=
−4
×
6
x
=
−12
(10)
−5
x
:
125
=
−4
:
−5
−5
×
(
−5
)
x
=
125
×
(
−4
)
x
=
−20
(11)
−4
:
6
=
2
x
:
−6
6
×
2
x
=
−4
×
(
−6
)
x
=
2
(12)
−8
:
−4
x
=
−1
:
3
−
(
−4
)
x
=
−8
×
3
x
=
−6
(13)
−2
:
3
=
−3
x
:
36
3
×
(
−3
)
x
=
−2
×
36
x
=
8
(14)
−12
:
3
=
4
x
:
−4
3
×
4
x
=
−12
×
(
−4
)
x
=
4
(15)
−6
:
−4
=
−3
:
x
−
3
−6
×
(
x
−
3
)
=
−4
×
(
−3
)
x
−
3
=
−2
x
=
1
(16)
5
x
:
10
=
2
:
1
5
x
=
10
×
2
x
=
4