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©2025 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
:
1
=
2
x
:
−8
(2)
−5
:
1
=
−50
:
2
x
(3)
−8
:
−2
x
=
6
:
3
(4)
−5
:
3
=
15
:
3
x
(5)
−8
:
12
=
−2
:
x
−
2
(6)
−6
:
2
x
=
−1
:
−4
(7)
4
:
−1
=
4
x
:
−20
(8)
8
:
−10
=
x
−
4
:
−5
(9)
−12
:
−3
x
=
−3
:
3
(10)
−2
x
:
−2
=
−16
:
−4
(11)
20
:
−5
=
x
−
4
:
−3
(12)
5
:
−4
=
−25
:
−
x
(13)
−15
:
−3
=
x
+
4
:
3
(14)
−10
:
x
+
3
=
−5
:
2
(15)
−4
:
1
=
20
:
x
−
2
(16)
2
:
x
−
1
=
1
:
−2
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−1
:
1
=
2
x
:
−8
2
x
=
−
(
−8
)
x
=
4
(2)
−5
:
1
=
−50
:
2
x
−5
×
2
x
=
−50
x
=
5
(3)
−8
:
−2
x
=
6
:
3
6
×
(
−2
)
x
=
−8
×
3
x
=
2
(4)
−5
:
3
=
15
:
3
x
−5
×
3
x
=
3
×
15
x
=
−3
(5)
−8
:
12
=
−2
:
x
−
2
−8
×
(
x
−
2
)
=
12
×
(
−2
)
x
−
2
=
3
x
=
5
(6)
−6
:
2
x
=
−1
:
−4
−
2
x
=
−6
×
(
−4
)
x
=
−12
(7)
4
:
−1
=
4
x
:
−20
−
4
x
=
4
×
(
−20
)
x
=
20
(8)
8
:
−10
=
x
−
4
:
−5
−10
×
(
x
−
4
)
=
8
×
(
−5
)
x
−
4
=
4
x
=
8
(9)
−12
:
−3
x
=
−3
:
3
−3
×
(
−3
)
x
=
−12
×
3
x
=
−4
(10)
−2
x
:
−2
=
−16
:
−4
−4
×
(
−2
)
x
=
−2
×
(
−16
)
x
=
4
(11)
20
:
−5
=
x
−
4
:
−3
−5
×
(
x
−
4
)
=
20
×
(
−3
)
x
−
4
=
12
x
=
16
(12)
5
:
−4
=
−25
:
−
x
5
×
(
−1
)
x
=
−4
×
(
−25
)
x
=
−20
(13)
−15
:
−3
=
x
+
4
:
3
−3
×
(
x
+
4
)
=
−15
×
3
x
+
4
=
15
x
=
11
(14)
−10
:
x
+
3
=
−5
:
2
−5
×
(
x
+
3
)
=
−10
×
2
x
+
3
=
4
x
=
1
(15)
−4
:
1
=
20
:
x
−
2
−4
×
(
x
−
2
)
=
20
x
−
2
=
−5
x
=
−3
(16)
2
:
x
−
1
=
1
:
−2
x
−
1
=
2
×
(
−2
)
x
−
1
=
−4
x
=
−3