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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
x
:
−4
=
6
:
4
(2)
−4
:
−2
=
x
+
4
:
1
(3)
20
:
−5
x
=
3
:
−6
(4)
3
:
x
+
4
=
9
:
−12
(5)
8
:
4
=
x
−
1
:
−3
(6)
4
:
x
+
2
=
−2
:
−8
(7)
x
−
3
:
1
=
15
:
−5
(8)
−
x
:
−3
=
4
:
6
(9)
−2
:
−4
=
2
:
x
−
4
(10)
−20
:
−4
=
x
+
4
:
3
(11)
x
+
4
:
4
=
−8
:
−2
(12)
x
−
2
:
1
=
8
:
−4
(13)
−2
:
−8
=
−2
:
2
x
(14)
−5
x
:
45
=
−3
:
3
(15)
−1
:
4
=
x
−
2
:
12
(16)
25
:
x
−
1
=
−5
:
2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
x
:
−4
=
6
:
4
4
×
2
x
=
−4
×
6
x
=
−3
(2)
−4
:
−2
=
x
+
4
:
1
−2
×
(
x
+
4
)
=
−4
x
+
4
=
2
x
=
−2
(3)
20
:
−5
x
=
3
:
−6
3
×
(
−5
)
x
=
20
×
(
−6
)
x
=
8
(4)
3
:
x
+
4
=
9
:
−12
9
×
(
x
+
4
)
=
3
×
(
−12
)
x
+
4
=
−4
x
=
−8
(5)
8
:
4
=
x
−
1
:
−3
4
×
(
x
−
1
)
=
8
×
(
−3
)
x
−
1
=
−6
x
=
−5
(6)
4
:
x
+
2
=
−2
:
−8
−2
×
(
x
+
2
)
=
4
×
(
−8
)
x
+
2
=
16
x
=
14
(7)
x
−
3
:
1
=
15
:
−5
−5
×
(
x
−
3
)
=
15
x
−
3
=
−3
x
=
0
(8)
−
x
:
−3
=
4
:
6
6
×
(
−1
)
x
=
−3
×
4
x
=
2
(9)
−2
:
−4
=
2
:
x
−
4
−2
×
(
x
−
4
)
=
−4
×
2
x
−
4
=
4
x
=
8
(10)
−20
:
−4
=
x
+
4
:
3
−4
×
(
x
+
4
)
=
−20
×
3
x
+
4
=
15
x
=
11
(11)
x
+
4
:
4
=
−8
:
−2
−2
×
(
x
+
4
)
=
4
×
(
−8
)
x
+
4
=
16
x
=
12
(12)
x
−
2
:
1
=
8
:
−4
−4
×
(
x
−
2
)
=
8
x
−
2
=
−2
x
=
0
(13)
−2
:
−8
=
−2
:
2
x
−2
×
2
x
=
−8
×
(
−2
)
x
=
−4
(14)
−5
x
:
45
=
−3
:
3
3
×
(
−5
)
x
=
45
×
(
−3
)
x
=
9
(15)
−1
:
4
=
x
−
2
:
12
4
×
(
x
−
2
)
=
−
12
x
−
2
=
−3
x
=
−1
(16)
25
:
x
−
1
=
−5
:
2
−5
×
(
x
−
1
)
=
25
×
2
x
−
1
=
−10
x
=
−9