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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
+
5
:
−12
=
−4
:
−16
(2)
3
:
x
+
5
=
1
:
−1
(3)
2
:
10
=
−1
:
x
−
2
(4)
−3
:
x
+
4
=
3
:
−1
(5)
−2
:
2
=
20
:
4
x
(6)
12
:
−8
=
9
:
3
x
(7)
4
x
:
−4
=
−4
:
2
(8)
10
:
8
=
−4
x
:
16
(9)
−5
:
3
=
x
−
1
:
−15
(10)
16
:
4
x
=
−4
:
5
(11)
x
−
2
:
−15
=
3
:
5
(12)
−10
:
x
−
3
=
−2
:
4
(13)
−2
:
x
−
4
=
2
:
1
(14)
−4
:
1
=
−
x
:
5
(15)
1
:
−2
=
−4
x
:
16
(16)
4
:
1
=
20
:
x
−
1
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
+
5
:
−12
=
−4
:
−16
−16
×
(
x
+
5
)
=
−12
×
(
−4
)
x
+
5
=
−3
x
=
−8
(2)
3
:
x
+
5
=
1
:
−1
x
+
5
=
3
×
(
−1
)
x
+
5
=
−3
x
=
−8
(3)
2
:
10
=
−1
:
x
−
2
2
×
(
x
−
2
)
=
10
×
(
−1
)
x
−
2
=
−5
x
=
−3
(4)
−3
:
x
+
4
=
3
:
−1
3
×
(
x
+
4
)
=
−3
×
(
−1
)
x
+
4
=
1
x
=
−3
(5)
−2
:
2
=
20
:
4
x
−2
×
4
x
=
2
×
20
x
=
−5
(6)
12
:
−8
=
9
:
3
x
12
×
3
x
=
−8
×
9
x
=
−2
(7)
4
x
:
−4
=
−4
:
2
2
×
4
x
=
−4
×
(
−4
)
x
=
2
(8)
10
:
8
=
−4
x
:
16
8
×
(
−4
)
x
=
10
×
16
x
=
−5
(9)
−5
:
3
=
x
−
1
:
−15
3
×
(
x
−
1
)
=
−5
×
(
−15
)
x
−
1
=
25
x
=
26
(10)
16
:
4
x
=
−4
:
5
−4
×
4
x
=
16
×
5
x
=
−5
(11)
x
−
2
:
−15
=
3
:
5
5
×
(
x
−
2
)
=
−15
×
3
x
−
2
=
−9
x
=
−7
(12)
−10
:
x
−
3
=
−2
:
4
−2
×
(
x
−
3
)
=
−10
×
4
x
−
3
=
20
x
=
23
(13)
−2
:
x
−
4
=
2
:
1
2
×
(
x
−
4
)
=
−2
x
−
4
=
−1
x
=
3
(14)
−4
:
1
=
−
x
:
5
−1
x
=
−4
×
5
x
=
20
(15)
1
:
−2
=
−4
x
:
16
−2
×
(
−4
)
x
=
16
x
=
2
(16)
4
:
1
=
20
:
x
−
1
4
×
(
x
−
1
)
=
20
x
−
1
=
5
x
=
6