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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)
1
:
2
=
−2
x
:
−8
(2)
−4
:
x
+
4
=
16
:
−4
(3)
3
:
12
=
x
−
2
:
−8
(4)
−8
:
2
=
20
:
x
−
4
(5)
−1
:
−2
=
−5
:
x
+
5
(6)
−1
:
1
=
−6
:
2
x
(7)
12
:
−4
x
=
5
:
15
(8)
4
:
x
+
5
=
−8
:
2
(9)
x
+
5
:
1
=
−4
:
−2
(10)
−10
:
x
+
5
=
−25
:
5
(11)
−9
:
−3
=
15
:
x
−
3
(12)
4
:
x
+
4
=
6
:
−3
(13)
−8
:
20
=
6
:
3
x
(14)
45
:
−5
x
=
9
:
3
(15)
−4
:
−1
=
x
+
5
:
−3
(16)
4
x
:
16
=
15
:
12
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
1
:
2
=
−2
x
:
−8
2
×
(
−2
)
x
=
−8
x
=
2
(2)
−4
:
x
+
4
=
16
:
−4
16
×
(
x
+
4
)
=
−4
×
(
−4
)
x
+
4
=
1
x
=
−3
(3)
3
:
12
=
x
−
2
:
−8
12
×
(
x
−
2
)
=
3
×
(
−8
)
x
−
2
=
−2
x
=
0
(4)
−8
:
2
=
20
:
x
−
4
−8
×
(
x
−
4
)
=
2
×
20
x
−
4
=
−5
x
=
−1
(5)
−1
:
−2
=
−5
:
x
+
5
−
(
x
+
5
)
=
−2
×
(
−5
)
x
+
5
=
−10
x
=
−15
(6)
−1
:
1
=
−6
:
2
x
−
2
x
=
−6
x
=
3
(7)
12
:
−4
x
=
5
:
15
5
×
(
−4
)
x
=
12
×
15
x
=
−9
(8)
4
:
x
+
5
=
−8
:
2
−8
×
(
x
+
5
)
=
4
×
2
x
+
5
=
−1
x
=
−6
(9)
x
+
5
:
1
=
−4
:
−2
−2
×
(
x
+
5
)
=
−4
x
+
5
=
2
x
=
−3
(10)
−10
:
x
+
5
=
−25
:
5
−25
×
(
x
+
5
)
=
−10
×
5
x
+
5
=
2
x
=
−3
(11)
−9
:
−3
=
15
:
x
−
3
−9
×
(
x
−
3
)
=
−3
×
15
x
−
3
=
5
x
=
8
(12)
4
:
x
+
4
=
6
:
−3
6
×
(
x
+
4
)
=
4
×
(
−3
)
x
+
4
=
−2
x
=
−6
(13)
−8
:
20
=
6
:
3
x
−8
×
3
x
=
20
×
6
x
=
−5
(14)
45
:
−5
x
=
9
:
3
9
×
(
−5
)
x
=
45
×
3
x
=
−3
(15)
−4
:
−1
=
x
+
5
:
−3
−
(
x
+
5
)
=
−4
×
(
−3
)
x
+
5
=
−12
x
=
−17
(16)
4
x
:
16
=
15
:
12
12
×
4
x
=
16
×
15
x
=
5