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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)
−2
:
4
=
x
−
4
:
−10
(2)
−25
:
−20
=
x
−
1
:
4
(3)
−1
:
1
=
x
−
2
:
2
(4)
5
:
10
=
−8
:
−4
x
(5)
8
:
x
+
3
=
2
:
−5
(6)
−5
:
x
−
1
=
15
:
−3
(7)
−5
:
−4
=
x
+
2
:
−12
(8)
5
:
−10
=
−3
:
3
x
(9)
−5
:
−20
=
3
x
:
48
(10)
1
:
x
−
2
=
2
:
4
(11)
−4
x
:
−8
=
2
:
1
(12)
x
−
1
:
2
=
−25
:
10
(13)
−2
:
x
−
1
=
−1
:
−2
(14)
−3
:
4
=
15
:
x
−
2
(15)
−3
:
2
=
−3
x
:
18
(16)
x
−
3
:
25
=
−1
:
5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−2
:
4
=
x
−
4
:
−10
4
×
(
x
−
4
)
=
−2
×
(
−10
)
x
−
4
=
5
x
=
9
(2)
−25
:
−20
=
x
−
1
:
4
−20
×
(
x
−
1
)
=
−25
×
4
x
−
1
=
5
x
=
6
(3)
−1
:
1
=
x
−
2
:
2
x
−
2
=
−
2
x
−
2
=
−2
x
=
0
(4)
5
:
10
=
−8
:
−4
x
5
×
(
−4
)
x
=
10
×
(
−8
)
x
=
4
(5)
8
:
x
+
3
=
2
:
−5
2
×
(
x
+
3
)
=
8
×
(
−5
)
x
+
3
=
−20
x
=
−23
(6)
−5
:
x
−
1
=
15
:
−3
15
×
(
x
−
1
)
=
−5
×
(
−3
)
x
−
1
=
1
x
=
2
(7)
−5
:
−4
=
x
+
2
:
−12
−4
×
(
x
+
2
)
=
−5
×
(
−12
)
x
+
2
=
−15
x
=
−17
(8)
5
:
−10
=
−3
:
3
x
5
×
3
x
=
−10
×
(
−3
)
x
=
2
(9)
−5
:
−20
=
3
x
:
48
−20
×
3
x
=
−5
×
48
x
=
4
(10)
1
:
x
−
2
=
2
:
4
2
×
(
x
−
2
)
=
4
x
−
2
=
2
x
=
4
(11)
−4
x
:
−8
=
2
:
1
−4
x
=
−8
×
2
x
=
4
(12)
x
−
1
:
2
=
−25
:
10
10
×
(
x
−
1
)
=
2
×
(
−25
)
x
−
1
=
−5
x
=
−4
(13)
−2
:
x
−
1
=
−1
:
−2
−
(
x
−
1
)
=
−2
×
(
−2
)
x
−
1
=
−4
x
=
−3
(14)
−3
:
4
=
15
:
x
−
2
−3
×
(
x
−
2
)
=
4
×
15
x
−
2
=
−20
x
=
−18
(15)
−3
:
2
=
−3
x
:
18
2
×
(
−3
)
x
=
−3
×
18
x
=
9
(16)
x
−
3
:
25
=
−1
:
5
5
×
(
x
−
3
)
=
25
×
(
−1
)
x
−
3
=
−5
x
=
−2