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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)
−3
:
1
=
x
+
2
:
2
(2)
4
x
:
−16
=
8
:
16
(3)
5
:
−1
=
x
+
2
:
−2
(4)
−12
:
−3
=
−4
:
x
−
5
(5)
2
:
x
−
3
=
1
:
5
(6)
−2
:
5
=
3
x
:
−45
(7)
−4
:
1
=
x
+
3
:
3
(8)
−2
x
:
10
=
−10
:
−25
(9)
−4
:
2
=
30
:
3
x
(10)
−6
:
9
=
x
+
3
:
−3
(11)
4
:
−5
=
−80
:
−5
x
(12)
5
x
:
−30
=
−5
:
−10
(13)
2
:
4
=
−2
x
:
12
(14)
5
x
:
−60
=
3
:
9
(15)
8
:
−
x
=
−12
:
3
(16)
5
:
1
=
−15
:
x
−
5
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−3
:
1
=
x
+
2
:
2
x
+
2
=
−3
×
2
x
+
2
=
−6
x
=
−8
(2)
4
x
:
−16
=
8
:
16
16
×
4
x
=
−16
×
8
x
=
−2
(3)
5
:
−1
=
x
+
2
:
−2
−
(
x
+
2
)
=
5
×
(
−2
)
x
+
2
=
10
x
=
8
(4)
−12
:
−3
=
−4
:
x
−
5
−12
×
(
x
−
5
)
=
−3
×
(
−4
)
x
−
5
=
−1
x
=
4
(5)
2
:
x
−
3
=
1
:
5
x
−
3
=
2
×
5
x
−
3
=
10
x
=
13
(6)
−2
:
5
=
3
x
:
−45
5
×
3
x
=
−2
×
(
−45
)
x
=
6
(7)
−4
:
1
=
x
+
3
:
3
x
+
3
=
−4
×
3
x
+
3
=
−12
x
=
−15
(8)
−2
x
:
10
=
−10
:
−25
−25
×
(
−2
)
x
=
10
×
(
−10
)
x
=
−2
(9)
−4
:
2
=
30
:
3
x
−4
×
3
x
=
2
×
30
x
=
−5
(10)
−6
:
9
=
x
+
3
:
−3
9
×
(
x
+
3
)
=
−6
×
(
−3
)
x
+
3
=
2
x
=
−1
(11)
4
:
−5
=
−80
:
−5
x
4
×
(
−5
)
x
=
−5
×
(
−80
)
x
=
−20
(12)
5
x
:
−30
=
−5
:
−10
−10
×
5
x
=
−30
×
(
−5
)
x
=
−3
(13)
2
:
4
=
−2
x
:
12
4
×
(
−2
)
x
=
2
×
12
x
=
−3
(14)
5
x
:
−60
=
3
:
9
9
×
5
x
=
−60
×
3
x
=
−4
(15)
8
:
−
x
=
−12
:
3
−12
×
(
−1
)
x
=
8
×
3
x
=
2
(16)
5
:
1
=
−15
:
x
−
5
5
×
(
x
−
5
)
=
−15
x
−
5
=
−3
x
=
2