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