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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)
8
:
12
=
−
x
:
3
(2)
1
:
x
−
3
=
2
:
−4
(3)
−8
:
−2
x
=
16
:
−16
(4)
x
+
4
:
2
=
−12
:
3
(5)
5
:
−25
=
−4
:
x
−
4
(6)
−8
:
16
=
−2
:
x
+
4
(7)
6
:
2
x
=
1
:
−2
(8)
10
:
2
=
3
x
:
−15
(9)
3
:
−9
=
x
+
2
:
−6
(10)
15
:
−10
=
4
x
:
8
(11)
2
:
−4
=
−2
:
−2
x
(12)
12
:
3
x
=
8
:
−2
(13)
4
:
−
x
=
5
:
−5
(14)
x
−
1
:
−12
=
−5
:
15
(15)
−5
x
:
−80
=
−5
:
20
(16)
−12
:
−3
x
=
8
:
−8
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
8
:
12
=
−
x
:
3
12
×
(
−1
)
x
=
8
×
3
x
=
−2
(2)
1
:
x
−
3
=
2
:
−4
2
×
(
x
−
3
)
=
−4
x
−
3
=
−2
x
=
1
(3)
−8
:
−2
x
=
16
:
−16
16
×
(
−2
)
x
=
−8
×
(
−16
)
x
=
−4
(4)
x
+
4
:
2
=
−12
:
3
3
×
(
x
+
4
)
=
2
×
(
−12
)
x
+
4
=
−8
x
=
−12
(5)
5
:
−25
=
−4
:
x
−
4
5
×
(
x
−
4
)
=
−25
×
(
−4
)
x
−
4
=
20
x
=
24
(6)
−8
:
16
=
−2
:
x
+
4
−8
×
(
x
+
4
)
=
16
×
(
−2
)
x
+
4
=
4
x
=
0
(7)
6
:
2
x
=
1
:
−2
2
x
=
6
×
(
−2
)
x
=
−6
(8)
10
:
2
=
3
x
:
−15
2
×
3
x
=
10
×
(
−15
)
x
=
−25
(9)
3
:
−9
=
x
+
2
:
−6
−9
×
(
x
+
2
)
=
3
×
(
−6
)
x
+
2
=
2
x
=
0
(10)
15
:
−10
=
4
x
:
8
−10
×
4
x
=
15
×
8
x
=
−3
(11)
2
:
−4
=
−2
:
−2
x
2
×
(
−2
)
x
=
−4
×
(
−2
)
x
=
−2
(12)
12
:
3
x
=
8
:
−2
8
×
3
x
=
12
×
(
−2
)
x
=
−1
(13)
4
:
−
x
=
5
:
−5
5
×
(
−1
)
x
=
4
×
(
−5
)
x
=
4
(14)
x
−
1
:
−12
=
−5
:
15
15
×
(
x
−
1
)
=
−12
×
(
−5
)
x
−
1
=
4
x
=
5
(15)
−5
x
:
−80
=
−5
:
20
20
×
(
−5
)
x
=
−80
×
(
−5
)
x
=
−4
(16)
−12
:
−3
x
=
8
:
−8
8
×
(
−3
)
x
=
−12
×
(
−8
)
x
=
−4