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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)
−5
x
:
−60
=
−1
:
3
(2)
4
:
−8
=
4
:
−4
x
(3)
x
+
3
:
3
=
−3
:
−1
(4)
x
−
5
:
−1
=
3
:
−3
(5)
−2
:
−4
=
x
−
2
:
−12
(6)
−2
:
−1
=
−6
:
−3
x
(7)
−2
:
−5
=
20
:
−5
x
(8)
−5
:
−3
=
−30
:
3
x
(9)
4
:
−
x
=
16
:
12
(10)
−3
:
−2
=
x
+
3
:
2
(11)
−5
x
:
10
=
−2
:
−4
(12)
5
:
25
=
−10
:
−5
x
(13)
−2
:
−1
=
−10
:
x
+
2
(14)
4
:
x
+
4
=
−20
:
−15
(15)
5
:
4
=
x
+
4
:
−4
(16)
−2
:
x
+
5
=
−4
:
2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−5
x
:
−60
=
−1
:
3
3
×
(
−5
)
x
=
−60
×
(
−1
)
x
=
−4
(2)
4
:
−8
=
4
:
−4
x
4
×
(
−4
)
x
=
−8
×
4
x
=
2
(3)
x
+
3
:
3
=
−3
:
−1
−
(
x
+
3
)
=
3
×
(
−3
)
x
+
3
=
9
x
=
6
(4)
x
−
5
:
−1
=
3
:
−3
−3
×
(
x
−
5
)
=
−
3
x
−
5
=
1
x
=
6
(5)
−2
:
−4
=
x
−
2
:
−12
−4
×
(
x
−
2
)
=
−2
×
(
−12
)
x
−
2
=
−6
x
=
−4
(6)
−2
:
−1
=
−6
:
−3
x
−2
×
(
−3
)
x
=
−
(
−6
)
x
=
1
(7)
−2
:
−5
=
20
:
−5
x
−2
×
(
−5
)
x
=
−5
×
20
x
=
−10
(8)
−5
:
−3
=
−30
:
3
x
−5
×
3
x
=
−3
×
(
−30
)
x
=
−6
(9)
4
:
−
x
=
16
:
12
16
×
(
−1
)
x
=
4
×
12
x
=
−3
(10)
−3
:
−2
=
x
+
3
:
2
−2
×
(
x
+
3
)
=
−3
×
2
x
+
3
=
3
x
=
0
(11)
−5
x
:
10
=
−2
:
−4
−4
×
(
−5
)
x
=
10
×
(
−2
)
x
=
−1
(12)
5
:
25
=
−10
:
−5
x
5
×
(
−5
)
x
=
25
×
(
−10
)
x
=
10
(13)
−2
:
−1
=
−10
:
x
+
2
−2
×
(
x
+
2
)
=
−
(
−10
)
x
+
2
=
−5
x
=
−7
(14)
4
:
x
+
4
=
−20
:
−15
−20
×
(
x
+
4
)
=
4
×
(
−15
)
x
+
4
=
3
x
=
−1
(15)
5
:
4
=
x
+
4
:
−4
4
×
(
x
+
4
)
=
5
×
(
−4
)
x
+
4
=
−5
x
=
−9
(16)
−2
:
x
+
5
=
−4
:
2
−4
×
(
x
+
5
)
=
−2
×
2
x
+
5
=
1
x
=
−4