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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)
4
:
−2
=
−3
x
:
12
(2)
−
x
:
−4
=
−15
:
−3
(3)
−3
:
x
+
2
=
−1
:
−4
(4)
x
+
4
:
8
=
−3
:
−2
(5)
x
+
5
:
−1
=
−20
:
4
(6)
6
:
10
=
−3
:
x
−
2
(7)
4
:
1
=
x
+
3
:
3
(8)
x
−
1
:
15
=
−1
:
5
(9)
−4
:
−1
=
−5
x
:
25
(10)
5
x
:
−60
=
1
:
4
(11)
1
:
x
+
4
=
2
:
4
(12)
32
:
−4
x
=
−2
:
−1
(13)
−4
:
−3
=
4
:
x
+
4
(14)
5
x
:
25
=
4
:
2
(15)
2
:
1
=
−
x
:
2
(16)
3
x
:
−45
=
−4
:
12
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
4
:
−2
=
−3
x
:
12
−2
×
(
−3
)
x
=
4
×
12
x
=
8
(2)
−
x
:
−4
=
−15
:
−3
−3
×
(
−1
)
x
=
−4
×
(
−15
)
x
=
20
(3)
−3
:
x
+
2
=
−1
:
−4
−
(
x
+
2
)
=
−3
×
(
−4
)
x
+
2
=
−12
x
=
−14
(4)
x
+
4
:
8
=
−3
:
−2
−2
×
(
x
+
4
)
=
8
×
(
−3
)
x
+
4
=
12
x
=
8
(5)
x
+
5
:
−1
=
−20
:
4
4
×
(
x
+
5
)
=
−
(
−20
)
x
+
5
=
5
x
=
0
(6)
6
:
10
=
−3
:
x
−
2
6
×
(
x
−
2
)
=
10
×
(
−3
)
x
−
2
=
−5
x
=
−3
(7)
4
:
1
=
x
+
3
:
3
x
+
3
=
4
×
3
x
+
3
=
12
x
=
9
(8)
x
−
1
:
15
=
−1
:
5
5
×
(
x
−
1
)
=
15
×
(
−1
)
x
−
1
=
−3
x
=
−2
(9)
−4
:
−1
=
−5
x
:
25
−
(
−5
)
x
=
−4
×
25
x
=
−20
(10)
5
x
:
−60
=
1
:
4
4
×
5
x
=
−60
x
=
−3
(11)
1
:
x
+
4
=
2
:
4
2
×
(
x
+
4
)
=
4
x
+
4
=
2
x
=
−2
(12)
32
:
−4
x
=
−2
:
−1
−2
×
(
−4
)
x
=
32
×
(
−1
)
x
=
−4
(13)
−4
:
−3
=
4
:
x
+
4
−4
×
(
x
+
4
)
=
−3
×
4
x
+
4
=
3
x
=
−1
(14)
5
x
:
25
=
4
:
2
2
×
5
x
=
25
×
4
x
=
10
(15)
2
:
1
=
−
x
:
2
−1
x
=
2
×
2
x
=
−4
(16)
3
x
:
−45
=
−4
:
12
12
×
3
x
=
−45
×
(
−4
)
x
=
5