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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)
9
:
−3
=
−9
:
−3
x
(2)
15
:
−3
=
20
:
x
−
3
(3)
x
+
2
:
4
=
1
:
2
(4)
x
−
4
:
2
=
−15
:
10
(5)
3
:
−2
=
−2
x
:
8
(6)
x
+
5
:
−4
=
−15
:
20
(7)
5
:
25
=
−4
:
x
+
3
(8)
−5
:
x
+
4
=
2
:
6
(9)
−4
x
:
16
=
20
:
5
(10)
16
:
−16
=
20
:
−5
x
(11)
8
:
−4
x
=
−4
:
−2
(12)
2
:
−1
=
4
:
x
+
4
(13)
5
:
3
=
25
:
x
+
5
(14)
−5
:
1
=
40
:
2
x
(15)
1
:
−1
=
−20
:
−4
x
(16)
x
−
5
:
−15
=
−4
:
12
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
9
:
−3
=
−9
:
−3
x
9
×
(
−3
)
x
=
−3
×
(
−9
)
x
=
−1
(2)
15
:
−3
=
20
:
x
−
3
15
×
(
x
−
3
)
=
−3
×
20
x
−
3
=
−4
x
=
−1
(3)
x
+
2
:
4
=
1
:
2
2
×
(
x
+
2
)
=
4
x
+
2
=
2
x
=
0
(4)
x
−
4
:
2
=
−15
:
10
10
×
(
x
−
4
)
=
2
×
(
−15
)
x
−
4
=
−3
x
=
1
(5)
3
:
−2
=
−2
x
:
8
−2
×
(
−2
)
x
=
3
×
8
x
=
6
(6)
x
+
5
:
−4
=
−15
:
20
20
×
(
x
+
5
)
=
−4
×
(
−15
)
x
+
5
=
3
x
=
−2
(7)
5
:
25
=
−4
:
x
+
3
5
×
(
x
+
3
)
=
25
×
(
−4
)
x
+
3
=
−20
x
=
−23
(8)
−5
:
x
+
4
=
2
:
6
2
×
(
x
+
4
)
=
−5
×
6
x
+
4
=
−15
x
=
−19
(9)
−4
x
:
16
=
20
:
5
5
×
(
−4
)
x
=
16
×
20
x
=
−16
(10)
16
:
−16
=
20
:
−5
x
16
×
(
−5
)
x
=
−16
×
20
x
=
4
(11)
8
:
−4
x
=
−4
:
−2
−4
×
(
−4
)
x
=
8
×
(
−2
)
x
=
−1
(12)
2
:
−1
=
4
:
x
+
4
2
×
(
x
+
4
)
=
−
4
x
+
4
=
−2
x
=
−6
(13)
5
:
3
=
25
:
x
+
5
5
×
(
x
+
5
)
=
3
×
25
x
+
5
=
15
x
=
10
(14)
−5
:
1
=
40
:
2
x
−5
×
2
x
=
40
x
=
−4
(15)
1
:
−1
=
−20
:
−4
x
−4
x
=
−
(
−20
)
x
=
−5
(16)
x
−
5
:
−15
=
−4
:
12
12
×
(
x
−
5
)
=
−15
×
(
−4
)
x
−
5
=
5
x
=
10