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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)
1
:
x
+
2
=
3
:
−3
(2)
2
x
:
2
=
−6
:
−3
(3)
−2
:
−6
=
−12
:
3
x
(4)
1
:
5
=
5
x
:
−25
(5)
−2
:
−4
=
−8
:
x
+
5
(6)
8
:
−4
=
−2
x
:
4
(7)
−2
:
5
=
x
+
2
:
−25
(8)
x
−
1
:
4
=
5
:
10
(9)
3
x
:
−75
=
1
:
5
(10)
−4
:
−1
=
x
+
4
:
1
(11)
24
:
−3
x
=
−4
:
3
(12)
4
:
2
=
2
:
x
+
3
(13)
−1
:
x
+
2
=
−5
:
15
(14)
3
:
−9
=
−3
x
:
9
(15)
4
:
x
+
2
=
2
:
3
(16)
−2
:
10
=
x
−
2
:
−25
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
1
:
x
+
2
=
3
:
−3
3
×
(
x
+
2
)
=
−3
x
+
2
=
−1
x
=
−3
(2)
2
x
:
2
=
−6
:
−3
−3
×
2
x
=
2
×
(
−6
)
x
=
2
(3)
−2
:
−6
=
−12
:
3
x
−2
×
3
x
=
−6
×
(
−12
)
x
=
−12
(4)
1
:
5
=
5
x
:
−25
5
×
5
x
=
−25
x
=
−1
(5)
−2
:
−4
=
−8
:
x
+
5
−2
×
(
x
+
5
)
=
−4
×
(
−8
)
x
+
5
=
−16
x
=
−21
(6)
8
:
−4
=
−2
x
:
4
−4
×
(
−2
)
x
=
8
×
4
x
=
4
(7)
−2
:
5
=
x
+
2
:
−25
5
×
(
x
+
2
)
=
−2
×
(
−25
)
x
+
2
=
10
x
=
8
(8)
x
−
1
:
4
=
5
:
10
10
×
(
x
−
1
)
=
4
×
5
x
−
1
=
2
x
=
3
(9)
3
x
:
−75
=
1
:
5
5
×
3
x
=
−75
x
=
−5
(10)
−4
:
−1
=
x
+
4
:
1
−
(
x
+
4
)
=
−4
x
+
4
=
4
x
=
0
(11)
24
:
−3
x
=
−4
:
3
−4
×
(
−3
)
x
=
24
×
3
x
=
6
(12)
4
:
2
=
2
:
x
+
3
4
×
(
x
+
3
)
=
2
×
2
x
+
3
=
1
x
=
−2
(13)
−1
:
x
+
2
=
−5
:
15
−5
×
(
x
+
2
)
=
−
15
x
+
2
=
3
x
=
1
(14)
3
:
−9
=
−3
x
:
9
−9
×
(
−3
)
x
=
3
×
9
x
=
1
(15)
4
:
x
+
2
=
2
:
3
2
×
(
x
+
2
)
=
4
×
3
x
+
2
=
6
x
=
4
(16)
−2
:
10
=
x
−
2
:
−25
10
×
(
x
−
2
)
=
−2
×
(
−25
)
x
−
2
=
5
x
=
7