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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
:
2
=
2
x
:
−2
(2)
1
:
−1
=
x
+
2
:
−5
(3)
−2
:
2
x
=
−2
:
8
(4)
−5
:
−15
=
−4
x
:
−12
(5)
x
−
3
:
3
=
−8
:
−12
(6)
2
:
−3
=
2
x
:
18
(7)
−2
:
x
−
1
=
6
:
−9
(8)
−2
:
−4
=
2
:
2
x
(9)
−9
:
−6
=
−5
x
:
−10
(10)
−3
x
:
−12
=
5
:
−4
(11)
2
:
x
−
1
=
4
:
2
(12)
4
:
x
−
5
=
12
:
9
(13)
−5
:
3
=
x
+
3
:
−3
(14)
6
:
−10
=
15
:
5
x
(15)
4
:
−2
=
x
−
2
:
−3
(16)
−12
:
3
x
=
5
:
10
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−8
:
2
=
2
x
:
−2
2
×
2
x
=
−8
×
(
−2
)
x
=
4
(2)
1
:
−1
=
x
+
2
:
−5
−
(
x
+
2
)
=
−5
x
+
2
=
5
x
=
3
(3)
−2
:
2
x
=
−2
:
8
−2
×
2
x
=
−2
×
8
x
=
4
(4)
−5
:
−15
=
−4
x
:
−12
−15
×
(
−4
)
x
=
−5
×
(
−12
)
x
=
1
(5)
x
−
3
:
3
=
−8
:
−12
−12
×
(
x
−
3
)
=
3
×
(
−8
)
x
−
3
=
2
x
=
5
(6)
2
:
−3
=
2
x
:
18
−3
×
2
x
=
2
×
18
x
=
−6
(7)
−2
:
x
−
1
=
6
:
−9
6
×
(
x
−
1
)
=
−2
×
(
−9
)
x
−
1
=
3
x
=
4
(8)
−2
:
−4
=
2
:
2
x
−2
×
2
x
=
−4
×
2
x
=
2
(9)
−9
:
−6
=
−5
x
:
−10
−6
×
(
−5
)
x
=
−9
×
(
−10
)
x
=
3
(10)
−3
x
:
−12
=
5
:
−4
−4
×
(
−3
)
x
=
−12
×
5
x
=
−5
(11)
2
:
x
−
1
=
4
:
2
4
×
(
x
−
1
)
=
2
×
2
x
−
1
=
1
x
=
2
(12)
4
:
x
−
5
=
12
:
9
12
×
(
x
−
5
)
=
4
×
9
x
−
5
=
3
x
=
8
(13)
−5
:
3
=
x
+
3
:
−3
3
×
(
x
+
3
)
=
−5
×
(
−3
)
x
+
3
=
5
x
=
2
(14)
6
:
−10
=
15
:
5
x
6
×
5
x
=
−10
×
15
x
=
−5
(15)
4
:
−2
=
x
−
2
:
−3
−2
×
(
x
−
2
)
=
4
×
(
−3
)
x
−
2
=
6
x
=
8
(16)
−12
:
3
x
=
5
:
10
5
×
3
x
=
−12
×
10
x
=
−8