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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)
x
−
2
:
−9
=
−4
:
12
(2)
9
:
−12
=
−9
:
−3
x
(3)
−5
x
:
10
=
−16
:
−8
(4)
−1
:
−2
=
15
:
−3
x
(5)
2
:
1
=
3
x
:
12
(6)
4
:
−2
=
−6
:
x
+
5
(7)
−3
x
:
12
=
−20
:
16
(8)
x
+
3
:
−5
=
−20
:
25
(9)
2
:
3
=
20
:
−2
x
(10)
4
x
:
−40
=
−5
:
10
(11)
−60
:
−4
x
=
6
:
−2
(12)
1
:
x
−
2
=
5
:
−5
(13)
4
:
x
−
4
=
8
:
−4
(14)
−3
x
:
75
=
−1
:
−5
(15)
2
:
−1
=
2
x
:
−10
(16)
−4
x
:
40
=
−3
:
15
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
−
2
:
−9
=
−4
:
12
12
×
(
x
−
2
)
=
−9
×
(
−4
)
x
−
2
=
3
x
=
5
(2)
9
:
−12
=
−9
:
−3
x
9
×
(
−3
)
x
=
−12
×
(
−9
)
x
=
−4
(3)
−5
x
:
10
=
−16
:
−8
−8
×
(
−5
)
x
=
10
×
(
−16
)
x
=
−4
(4)
−1
:
−2
=
15
:
−3
x
−
(
−3
)
x
=
−2
×
15
x
=
−10
(5)
2
:
1
=
3
x
:
12
3
x
=
2
×
12
x
=
8
(6)
4
:
−2
=
−6
:
x
+
5
4
×
(
x
+
5
)
=
−2
×
(
−6
)
x
+
5
=
3
x
=
−2
(7)
−3
x
:
12
=
−20
:
16
16
×
(
−3
)
x
=
12
×
(
−20
)
x
=
5
(8)
x
+
3
:
−5
=
−20
:
25
25
×
(
x
+
3
)
=
−5
×
(
−20
)
x
+
3
=
4
x
=
1
(9)
2
:
3
=
20
:
−2
x
2
×
(
−2
)
x
=
3
×
20
x
=
−15
(10)
4
x
:
−40
=
−5
:
10
10
×
4
x
=
−40
×
(
−5
)
x
=
5
(11)
−60
:
−4
x
=
6
:
−2
6
×
(
−4
)
x
=
−60
×
(
−2
)
x
=
−5
(12)
1
:
x
−
2
=
5
:
−5
5
×
(
x
−
2
)
=
−5
x
−
2
=
−1
x
=
1
(13)
4
:
x
−
4
=
8
:
−4
8
×
(
x
−
4
)
=
4
×
(
−4
)
x
−
4
=
−2
x
=
2
(14)
−3
x
:
75
=
−1
:
−5
−5
×
(
−3
)
x
=
75
×
(
−1
)
x
=
−5
(15)
2
:
−1
=
2
x
:
−10
−
2
x
=
2
×
(
−10
)
x
=
10
(16)
−4
x
:
40
=
−3
:
15
15
×
(
−4
)
x
=
40
×
(
−3
)
x
=
2