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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)
x
+
3
:
3
=
−8
:
12
(2)
8
:
x
+
2
=
−4
:
3
(3)
27
:
3
x
=
−9
:
3
(4)
25
:
−5
=
100
:
5
x
(5)
x
+
4
:
−6
=
−4
:
8
(6)
−6
:
6
=
−12
:
4
x
(7)
3
x
:
18
=
4
:
3
(8)
−3
:
5
=
12
:
x
−
3
(9)
−2
x
:
12
=
5
:
3
(10)
5
:
−1
=
x
−
5
:
−4
(11)
−16
:
−4
x
=
1
:
−5
(12)
−4
x
:
−20
=
−10
:
−2
(13)
−20
:
4
x
=
−1
:
−3
(14)
−5
:
5
=
2
:
−2
x
(15)
−2
x
:
−10
=
−20
:
25
(16)
−
x
:
25
=
4
:
20
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
+
3
:
3
=
−8
:
12
12
×
(
x
+
3
)
=
3
×
(
−8
)
x
+
3
=
−2
x
=
−5
(2)
8
:
x
+
2
=
−4
:
3
−4
×
(
x
+
2
)
=
8
×
3
x
+
2
=
−6
x
=
−8
(3)
27
:
3
x
=
−9
:
3
−9
×
3
x
=
27
×
3
x
=
−3
(4)
25
:
−5
=
100
:
5
x
25
×
5
x
=
−5
×
100
x
=
−4
(5)
x
+
4
:
−6
=
−4
:
8
8
×
(
x
+
4
)
=
−6
×
(
−4
)
x
+
4
=
3
x
=
−1
(6)
−6
:
6
=
−12
:
4
x
−6
×
4
x
=
6
×
(
−12
)
x
=
3
(7)
3
x
:
18
=
4
:
3
3
×
3
x
=
18
×
4
x
=
8
(8)
−3
:
5
=
12
:
x
−
3
−3
×
(
x
−
3
)
=
5
×
12
x
−
3
=
−20
x
=
−17
(9)
−2
x
:
12
=
5
:
3
3
×
(
−2
)
x
=
12
×
5
x
=
−10
(10)
5
:
−1
=
x
−
5
:
−4
−
(
x
−
5
)
=
5
×
(
−4
)
x
−
5
=
20
x
=
25
(11)
−16
:
−4
x
=
1
:
−5
−4
x
=
−16
×
(
−5
)
x
=
−20
(12)
−4
x
:
−20
=
−10
:
−2
−2
×
(
−4
)
x
=
−20
×
(
−10
)
x
=
25
(13)
−20
:
4
x
=
−1
:
−3
−
4
x
=
−20
×
(
−3
)
x
=
−15
(14)
−5
:
5
=
2
:
−2
x
−5
×
(
−2
)
x
=
5
×
2
x
=
1
(15)
−2
x
:
−10
=
−20
:
25
25
×
(
−2
)
x
=
−10
×
(
−20
)
x
=
−4
(16)
−
x
:
25
=
4
:
20
20
×
(
−1
)
x
=
25
×
4
x
=
−5