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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
+
4
:
2
=
12
:
8
(2)
−16
:
16
=
2
x
:
8
(3)
−3
x
:
−36
=
−3
:
4
(4)
12
:
−3
=
40
:
−5
x
(5)
5
:
−5
=
−6
:
3
x
(6)
x
+
3
:
−2
=
20
:
−4
(7)
−
x
:
−20
=
−1
:
4
(8)
1
:
x
−
2
=
2
:
4
(9)
−100
:
5
x
=
−12
:
−3
(10)
−4
:
4
=
x
−
5
:
3
(11)
−2
:
8
=
1
:
x
−
5
(12)
x
−
5
:
−8
=
3
:
2
(13)
−1
:
1
=
−4
:
x
+
4
(14)
−2
x
:
10
=
−20
:
−4
(15)
10
:
−15
=
2
:
x
+
5
(16)
−9
:
6
=
−3
:
x
+
3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
+
4
:
2
=
12
:
8
8
×
(
x
+
4
)
=
2
×
12
x
+
4
=
3
x
=
−1
(2)
−16
:
16
=
2
x
:
8
16
×
2
x
=
−16
×
8
x
=
−4
(3)
−3
x
:
−36
=
−3
:
4
4
×
(
−3
)
x
=
−36
×
(
−3
)
x
=
−9
(4)
12
:
−3
=
40
:
−5
x
12
×
(
−5
)
x
=
−3
×
40
x
=
2
(5)
5
:
−5
=
−6
:
3
x
5
×
3
x
=
−5
×
(
−6
)
x
=
2
(6)
x
+
3
:
−2
=
20
:
−4
−4
×
(
x
+
3
)
=
−2
×
20
x
+
3
=
10
x
=
7
(7)
−
x
:
−20
=
−1
:
4
4
×
(
−1
)
x
=
−20
×
(
−1
)
x
=
−5
(8)
1
:
x
−
2
=
2
:
4
2
×
(
x
−
2
)
=
4
x
−
2
=
2
x
=
4
(9)
−100
:
5
x
=
−12
:
−3
−12
×
5
x
=
−100
×
(
−3
)
x
=
−5
(10)
−4
:
4
=
x
−
5
:
3
4
×
(
x
−
5
)
=
−4
×
3
x
−
5
=
−3
x
=
2
(11)
−2
:
8
=
1
:
x
−
5
−2
×
(
x
−
5
)
=
8
x
−
5
=
−4
x
=
1
(12)
x
−
5
:
−8
=
3
:
2
2
×
(
x
−
5
)
=
−8
×
3
x
−
5
=
−12
x
=
−7
(13)
−1
:
1
=
−4
:
x
+
4
−
(
x
+
4
)
=
−4
x
+
4
=
4
x
=
0
(14)
−2
x
:
10
=
−20
:
−4
−4
×
(
−2
)
x
=
10
×
(
−20
)
x
=
−25
(15)
10
:
−15
=
2
:
x
+
5
10
×
(
x
+
5
)
=
−15
×
2
x
+
5
=
−3
x
=
−8
(16)
−9
:
6
=
−3
:
x
+
3
−9
×
(
x
+
3
)
=
6
×
(
−3
)
x
+
3
=
2
x
=
−1