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©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の比例式を解きなさい
[0G1-00]
(1)
−4
:
−16
=
−5
:
x
+
2
(2)
−4
x
:
4
=
5
:
−5
(3)
−2
:
−2
x
=
2
:
−4
(4)
x
−
2
:
3
=
5
:
−15
(5)
−4
x
:
−20
=
9
:
−15
(6)
−5
:
5
=
1
:
x
−
1
(7)
3
:
−3
=
x
+
2
:
−1
(8)
−1
:
5
=
10
:
−5
x
(9)
−3
:
5
=
−12
:
x
+
2
(10)
−1
:
5
=
5
:
x
+
5
(11)
2
:
10
=
x
−
1
:
−5
(12)
1
:
2
=
4
x
:
16
(13)
−5
:
x
+
2
=
−2
:
8
(14)
25
:
5
x
=
−2
:
8
(15)
8
:
x
+
4
=
−4
:
−1
(16)
x
+
3
:
−1
=
−6
:
−3
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−4
:
−16
=
−5
:
x
+
2
−4
×
(
x
+
2
)
=
−16
×
(
−5
)
x
+
2
=
−20
x
=
−22
(2)
−4
x
:
4
=
5
:
−5
−5
×
(
−4
)
x
=
4
×
5
x
=
1
(3)
−2
:
−2
x
=
2
:
−4
2
×
(
−2
)
x
=
−2
×
(
−4
)
x
=
−2
(4)
x
−
2
:
3
=
5
:
−15
−15
×
(
x
−
2
)
=
3
×
5
x
−
2
=
−1
x
=
1
(5)
−4
x
:
−20
=
9
:
−15
−15
×
(
−4
)
x
=
−20
×
9
x
=
−3
(6)
−5
:
5
=
1
:
x
−
1
−5
×
(
x
−
1
)
=
5
x
−
1
=
−1
x
=
0
(7)
3
:
−3
=
x
+
2
:
−1
−3
×
(
x
+
2
)
=
3
×
(
−1
)
x
+
2
=
1
x
=
−1
(8)
−1
:
5
=
10
:
−5
x
−
(
−5
)
x
=
5
×
10
x
=
10
(9)
−3
:
5
=
−12
:
x
+
2
−3
×
(
x
+
2
)
=
5
×
(
−12
)
x
+
2
=
20
x
=
18
(10)
−1
:
5
=
5
:
x
+
5
−
(
x
+
5
)
=
5
×
5
x
+
5
=
−25
x
=
−30
(11)
2
:
10
=
x
−
1
:
−5
10
×
(
x
−
1
)
=
2
×
(
−5
)
x
−
1
=
−1
x
=
0
(12)
1
:
2
=
4
x
:
16
2
×
4
x
=
16
x
=
2
(13)
−5
:
x
+
2
=
−2
:
8
−2
×
(
x
+
2
)
=
−5
×
8
x
+
2
=
20
x
=
18
(14)
25
:
5
x
=
−2
:
8
−2
×
5
x
=
25
×
8
x
=
−20
(15)
8
:
x
+
4
=
−4
:
−1
−4
×
(
x
+
4
)
=
8
×
(
−1
)
x
+
4
=
2
x
=
−2
(16)
x
+
3
:
−1
=
−6
:
−3
−3
×
(
x
+
3
)
=
−
(
−6
)
x
+
3
=
−2
x
=
−5