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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)
3
:
−3
=
−4
x
:
−12
(2)
3
:
−12
=
−3
:
x
−
5
(3)
10
:
x
−
1
=
2
:
−3
(4)
3
:
−1
=
15
:
x
+
3
(5)
−2
:
−1
=
−
x
:
5
(6)
−5
:
5
=
x
+
5
:
2
(7)
−6
:
−2
=
x
−
3
:
−1
(8)
4
:
−16
=
−2
:
−2
x
(9)
2
:
1
=
20
:
5
x
(10)
9
:
−3
x
=
−9
:
3
(11)
−6
:
−2
=
x
−
4
:
4
(12)
10
:
−5
=
−
x
:
−4
(13)
15
:
−5
x
=
12
:
8
(14)
−2
:
x
+
5
=
2
:
1
(15)
−4
:
−1
=
−16
:
−
x
(16)
2
x
:
4
=
1
:
−1
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
3
:
−3
=
−4
x
:
−12
−3
×
(
−4
)
x
=
3
×
(
−12
)
x
=
−3
(2)
3
:
−12
=
−3
:
x
−
5
3
×
(
x
−
5
)
=
−12
×
(
−3
)
x
−
5
=
12
x
=
17
(3)
10
:
x
−
1
=
2
:
−3
2
×
(
x
−
1
)
=
10
×
(
−3
)
x
−
1
=
−15
x
=
−14
(4)
3
:
−1
=
15
:
x
+
3
3
×
(
x
+
3
)
=
−
15
x
+
3
=
−5
x
=
−8
(5)
−2
:
−1
=
−
x
:
5
x
=
−2
×
5
x
=
−10
(6)
−5
:
5
=
x
+
5
:
2
5
×
(
x
+
5
)
=
−5
×
2
x
+
5
=
−2
x
=
−7
(7)
−6
:
−2
=
x
−
3
:
−1
−2
×
(
x
−
3
)
=
−6
×
(
−1
)
x
−
3
=
−3
x
=
0
(8)
4
:
−16
=
−2
:
−2
x
4
×
(
−2
)
x
=
−16
×
(
−2
)
x
=
−4
(9)
2
:
1
=
20
:
5
x
2
×
5
x
=
20
x
=
2
(10)
9
:
−3
x
=
−9
:
3
−9
×
(
−3
)
x
=
9
×
3
x
=
1
(11)
−6
:
−2
=
x
−
4
:
4
−2
×
(
x
−
4
)
=
−6
×
4
x
−
4
=
12
x
=
16
(12)
10
:
−5
=
−
x
:
−4
−5
×
(
−1
)
x
=
10
×
(
−4
)
x
=
−8
(13)
15
:
−5
x
=
12
:
8
12
×
(
−5
)
x
=
15
×
8
x
=
−2
(14)
−2
:
x
+
5
=
2
:
1
2
×
(
x
+
5
)
=
−2
x
+
5
=
−1
x
=
−6
(15)
−4
:
−1
=
−16
:
−
x
−4
×
(
−1
)
x
=
−
(
−16
)
x
=
4
(16)
2
x
:
4
=
1
:
−1
−
2
x
=
4
x
=
−2