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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)
−4
:
−2
=
x
−
1
:
1
(2)
−4
:
−8
=
x
−
2
:
−2
(3)
3
:
3
x
=
−1
:
3
(4)
−4
:
−2
=
2
:
x
−
1
(5)
36
:
3
x
=
−15
:
−5
(6)
3
:
−6
=
x
+
5
:
8
(7)
−3
:
15
=
x
+
3
:
−25
(8)
4
:
12
=
x
−
3
:
9
(9)
x
−
2
:
5
=
2
:
−10
(10)
−4
:
−8
=
−2
:
x
−
3
(11)
x
−
3
:
−10
=
5
:
−25
(12)
−16
:
12
=
−4
:
x
−
3
(13)
−12
:
−
x
=
−3
:
4
(14)
x
+
3
:
−1
=
−20
:
4
(15)
3
:
1
=
−27
:
−3
x
(16)
−4
:
x
+
4
=
10
:
−5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−4
:
−2
=
x
−
1
:
1
−2
×
(
x
−
1
)
=
−4
x
−
1
=
2
x
=
3
(2)
−4
:
−8
=
x
−
2
:
−2
−8
×
(
x
−
2
)
=
−4
×
(
−2
)
x
−
2
=
−1
x
=
1
(3)
3
:
3
x
=
−1
:
3
−
3
x
=
3
×
3
x
=
−3
(4)
−4
:
−2
=
2
:
x
−
1
−4
×
(
x
−
1
)
=
−2
×
2
x
−
1
=
1
x
=
2
(5)
36
:
3
x
=
−15
:
−5
−15
×
3
x
=
36
×
(
−5
)
x
=
4
(6)
3
:
−6
=
x
+
5
:
8
−6
×
(
x
+
5
)
=
3
×
8
x
+
5
=
−4
x
=
−9
(7)
−3
:
15
=
x
+
3
:
−25
15
×
(
x
+
3
)
=
−3
×
(
−25
)
x
+
3
=
5
x
=
2
(8)
4
:
12
=
x
−
3
:
9
12
×
(
x
−
3
)
=
4
×
9
x
−
3
=
3
x
=
6
(9)
x
−
2
:
5
=
2
:
−10
−10
×
(
x
−
2
)
=
5
×
2
x
−
2
=
−1
x
=
1
(10)
−4
:
−8
=
−2
:
x
−
3
−4
×
(
x
−
3
)
=
−8
×
(
−2
)
x
−
3
=
−4
x
=
−1
(11)
x
−
3
:
−10
=
5
:
−25
−25
×
(
x
−
3
)
=
−10
×
5
x
−
3
=
2
x
=
5
(12)
−16
:
12
=
−4
:
x
−
3
−16
×
(
x
−
3
)
=
12
×
(
−4
)
x
−
3
=
3
x
=
6
(13)
−12
:
−
x
=
−3
:
4
−3
×
(
−1
)
x
=
−12
×
4
x
=
−16
(14)
x
+
3
:
−1
=
−20
:
4
4
×
(
x
+
3
)
=
−
(
−20
)
x
+
3
=
5
x
=
2
(15)
3
:
1
=
−27
:
−3
x
3
×
(
−3
)
x
=
−27
x
=
3
(16)
−4
:
x
+
4
=
10
:
−5
10
×
(
x
+
4
)
=
−4
×
(
−5
)
x
+
4
=
2
x
=
−2