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