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