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