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