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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)
x
+
3
:
−10
=
−2
:
−4
(2)
x
−
1
:
1
=
8
:
4
(3)
−100
:
5
x
=
5
:
−4
(4)
−4
:
4
x
=
−4
:
16
(5)
15
:
−5
=
12
:
x
−
5
(6)
−3
:
1
=
x
−
4
:
4
(7)
25
:
x
−
5
=
−5
:
−3
(8)
−4
:
4
=
x
−
2
:
1
(9)
−4
x
:
−16
=
3
:
6
(10)
8
:
4
x
=
1
:
−4
(11)
−1
:
2
=
8
:
4
x
(12)
1
:
x
+
5
=
−2
:
−4
(13)
−4
:
−12
=
4
:
−4
x
(14)
−2
:
1
=
10
:
x
−
3
(15)
2
:
−5
=
5
x
:
25
(16)
−3
x
:
−60
=
−5
:
−25
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
+
3
:
−10
=
−2
:
−4
−4
×
(
x
+
3
)
=
−10
×
(
−2
)
x
+
3
=
−5
x
=
−8
(2)
x
−
1
:
1
=
8
:
4
4
×
(
x
−
1
)
=
8
x
−
1
=
2
x
=
3
(3)
−100
:
5
x
=
5
:
−4
5
×
5
x
=
−100
×
(
−4
)
x
=
16
(4)
−4
:
4
x
=
−4
:
16
−4
×
4
x
=
−4
×
16
x
=
4
(5)
15
:
−5
=
12
:
x
−
5
15
×
(
x
−
5
)
=
−5
×
12
x
−
5
=
−4
x
=
1
(6)
−3
:
1
=
x
−
4
:
4
x
−
4
=
−3
×
4
x
−
4
=
−12
x
=
−8
(7)
25
:
x
−
5
=
−5
:
−3
−5
×
(
x
−
5
)
=
25
×
(
−3
)
x
−
5
=
15
x
=
20
(8)
−4
:
4
=
x
−
2
:
1
4
×
(
x
−
2
)
=
−4
x
−
2
=
−1
x
=
1
(9)
−4
x
:
−16
=
3
:
6
6
×
(
−4
)
x
=
−16
×
3
x
=
2
(10)
8
:
4
x
=
1
:
−4
4
x
=
8
×
(
−4
)
x
=
−8
(11)
−1
:
2
=
8
:
4
x
−
4
x
=
2
×
8
x
=
−4
(12)
1
:
x
+
5
=
−2
:
−4
−2
×
(
x
+
5
)
=
−4
x
+
5
=
2
x
=
−3
(13)
−4
:
−12
=
4
:
−4
x
−4
×
(
−4
)
x
=
−12
×
4
x
=
−3
(14)
−2
:
1
=
10
:
x
−
3
−2
×
(
x
−
3
)
=
10
x
−
3
=
−5
x
=
−2
(15)
2
:
−5
=
5
x
:
25
−5
×
5
x
=
2
×
25
x
=
−2
(16)
−3
x
:
−60
=
−5
:
−25
−25
×
(
−3
)
x
=
−60
×
(
−5
)
x
=
4