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©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の比例式を解きなさい
[0G2-00]
(1)
−3
:
x
+
5
=
−4
:
x
(2)
x
−
20
:
x
=
−2
:
−10
(3)
x
:
x
+
12
=
2
:
10
(4)
x
:
1
=
x
+
2
:
2
(5)
x
−
9
:
−12
=
x
:
15
(6)
−3
:
−2
=
x
+
2
:
x
(7)
−3
:
x
+
1
=
−6
:
x
(8)
−2
:
−4
=
x
−
3
:
x
(9)
−4
:
x
=
5
:
−3
−
x
(10)
2
:
3
=
−20
−
x
:
x
(11)
x
−
15
:
4
=
x
:
−2
(12)
−4
:
x
=
−16
:
x
−
15
(13)
−12
:
8
=
x
:
−1
−
x
(14)
−2
:
x
=
8
:
x
−
25
(15)
x
+
3
:
−12
=
x
:
−3
(16)
2
−
x
:
−3
=
x
:
2
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−3
:
x
+
5
=
−4
:
x
−4
(
x
+
5
)
=
−3
x
−4
x
−
20
=
−3
x
x
=
−20
(2)
x
−
20
:
x
=
−2
:
−10
−10
(
x
−
20
)
=
−2
x
−10
x
+
200
=
−2
x
x
=
25
(3)
x
:
x
+
12
=
2
:
10
10
x
=
2
(
x
+
12
)
10
x
=
2
x
+
24
x
=
3
(4)
x
:
1
=
x
+
2
:
2
2
x
=
x
+
2
2
x
=
x
+
2
x
=
2
(5)
x
−
9
:
−12
=
x
:
15
15
(
x
−
9
)
=
−12
x
15
x
−
135
=
−12
x
x
=
5
(6)
−3
:
−2
=
x
+
2
:
x
−2
(
x
+
2
)
=
−3
x
−2
x
−
4
=
−3
x
x
=
4
(7)
−3
:
x
+
1
=
−6
:
x
−6
(
x
+
1
)
=
−3
x
−6
x
−
6
=
−3
x
x
=
−2
(8)
−2
:
−4
=
x
−
3
:
x
−4
(
x
−
3
)
=
−2
x
−4
x
+
12
=
−2
x
x
=
6
(9)
−4
:
x
=
5
:
−3
−
x
−4
(
−3
−
x
)
=
5
x
12
+
4
x
=
5
x
x
=
12
(10)
2
:
3
=
−20
−
x
:
x
3
(
−20
−
x
)
=
2
x
−60
−
3
x
=
2
x
x
=
−12
(11)
x
−
15
:
4
=
x
:
−2
−2
(
x
−
15
)
=
4
x
−2
x
+
30
=
4
x
x
=
5
(12)
−4
:
x
=
−16
:
x
−
15
−4
(
x
−
15
)
=
−16
x
−4
x
+
60
=
−16
x
x
=
−5
(13)
−12
:
8
=
x
:
−1
−
x
−12
(
−1
−
x
)
=
8
x
12
+
12
x
=
8
x
x
=
−3
(14)
−2
:
x
=
8
:
x
−
25
−2
(
x
−
25
)
=
8
x
−2
x
+
50
=
8
x
x
=
5
(15)
x
+
3
:
−12
=
x
:
−3
−3
(
x
+
3
)
=
−12
x
−3
x
−
9
=
−12
x
x
=
1
(16)
2
−
x
:
−3
=
x
:
2
2
(
2
−
x
)
=
−3
x
4
−
2
x
=
−3
x
x
=
−4