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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
=
−2
:
−4
(2)
−4
x
:
4
=
2
:
1
(3)
−3
:
2
=
−4
x
:
−40
(4)
32
:
2
x
=
−4
:
−5
(5)
4
:
2
x
=
4
:
2
(6)
−3
:
5
=
2
x
:
20
(7)
−4
:
x
−
2
=
2
:
1
(8)
2
:
x
−
1
=
−1
:
4
(9)
3
:
−1
=
x
+
5
:
−5
(10)
x
−
5
:
−5
=
20
:
−4
(11)
−4
:
4
=
−5
:
x
+
4
(12)
5
:
3
=
x
−
1
:
−3
(13)
8
:
x
+
2
=
12
:
−3
(14)
x
−
1
:
−2
=
−20
:
−10
(15)
12
:
−3
=
x
+
2
:
4
(16)
−2
:
4
=
3
x
:
6
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
16
:
4
x
=
−2
:
−4
−2
×
4
x
=
16
×
(
−4
)
x
=
8
(2)
−4
x
:
4
=
2
:
1
−4
x
=
4
×
2
x
=
−2
(3)
−3
:
2
=
−4
x
:
−40
2
×
(
−4
)
x
=
−3
×
(
−40
)
x
=
−15
(4)
32
:
2
x
=
−4
:
−5
−4
×
2
x
=
32
×
(
−5
)
x
=
20
(5)
4
:
2
x
=
4
:
2
4
×
2
x
=
4
×
2
x
=
1
(6)
−3
:
5
=
2
x
:
20
5
×
2
x
=
−3
×
20
x
=
−6
(7)
−4
:
x
−
2
=
2
:
1
2
×
(
x
−
2
)
=
−4
x
−
2
=
−2
x
=
0
(8)
2
:
x
−
1
=
−1
:
4
−
(
x
−
1
)
=
2
×
4
x
−
1
=
−8
x
=
−7
(9)
3
:
−1
=
x
+
5
:
−5
−
(
x
+
5
)
=
3
×
(
−5
)
x
+
5
=
15
x
=
10
(10)
x
−
5
:
−5
=
20
:
−4
−4
×
(
x
−
5
)
=
−5
×
20
x
−
5
=
25
x
=
30
(11)
−4
:
4
=
−5
:
x
+
4
−4
×
(
x
+
4
)
=
4
×
(
−5
)
x
+
4
=
5
x
=
1
(12)
5
:
3
=
x
−
1
:
−3
3
×
(
x
−
1
)
=
5
×
(
−3
)
x
−
1
=
−5
x
=
−4
(13)
8
:
x
+
2
=
12
:
−3
12
×
(
x
+
2
)
=
8
×
(
−3
)
x
+
2
=
−2
x
=
−4
(14)
x
−
1
:
−2
=
−20
:
−10
−10
×
(
x
−
1
)
=
−2
×
(
−20
)
x
−
1
=
−4
x
=
−3
(15)
12
:
−3
=
x
+
2
:
4
−3
×
(
x
+
2
)
=
12
×
4
x
+
2
=
−16
x
=
−18
(16)
−2
:
4
=
3
x
:
6
4
×
3
x
=
−2
×
6
x
=
−1