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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)
20
:
12
=
−20
:
4
x
(3)
x
−
4
:
5
=
−8
:
−2
(4)
−2
:
2
=
x
−
4
:
1
(5)
−9
:
15
=
3
:
x
+
5
(6)
4
:
2
x
=
1
:
−5
(7)
20
:
−4
=
2
x
:
−10
(8)
3
:
6
=
−6
:
3
x
(9)
16
:
2
x
=
−2
:
−1
(10)
3
:
−1
=
3
x
:
−9
(11)
5
:
4
=
4
x
:
−80
(12)
−4
:
8
=
x
+
4
:
2
(13)
−
x
:
3
=
−1
:
1
(14)
−3
:
−1
=
x
+
5
:
−3
(15)
−8
:
4
x
=
2
:
1
(16)
−2
:
2
=
10
:
−2
x
©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)
20
:
12
=
−20
:
4
x
20
×
4
x
=
12
×
(
−20
)
x
=
−3
(3)
x
−
4
:
5
=
−8
:
−2
−2
×
(
x
−
4
)
=
5
×
(
−8
)
x
−
4
=
20
x
=
24
(4)
−2
:
2
=
x
−
4
:
1
2
×
(
x
−
4
)
=
−2
x
−
4
=
−1
x
=
3
(5)
−9
:
15
=
3
:
x
+
5
−9
×
(
x
+
5
)
=
15
×
3
x
+
5
=
−5
x
=
−10
(6)
4
:
2
x
=
1
:
−5
2
x
=
4
×
(
−5
)
x
=
−10
(7)
20
:
−4
=
2
x
:
−10
−4
×
2
x
=
20
×
(
−10
)
x
=
25
(8)
3
:
6
=
−6
:
3
x
3
×
3
x
=
6
×
(
−6
)
x
=
−4
(9)
16
:
2
x
=
−2
:
−1
−2
×
2
x
=
16
×
(
−1
)
x
=
4
(10)
3
:
−1
=
3
x
:
−9
−
3
x
=
3
×
(
−9
)
x
=
9
(11)
5
:
4
=
4
x
:
−80
4
×
4
x
=
5
×
(
−80
)
x
=
−25
(12)
−4
:
8
=
x
+
4
:
2
8
×
(
x
+
4
)
=
−4
×
2
x
+
4
=
−1
x
=
−5
(13)
−
x
:
3
=
−1
:
1
−1
x
=
3
×
(
−1
)
x
=
3
(14)
−3
:
−1
=
x
+
5
:
−3
−
(
x
+
5
)
=
−3
×
(
−3
)
x
+
5
=
−9
x
=
−14
(15)
−8
:
4
x
=
2
:
1
2
×
4
x
=
−8
x
=
−1
(16)
−2
:
2
=
10
:
−2
x
−2
×
(
−2
)
x
=
2
×
10
x
=
5