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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)
4
:
2
x
=
−2
:
−8
(2)
−3
:
3
=
5
:
5
x
(3)
12
:
x
−
5
=
3
:
−5
(4)
−2
:
x
−
2
=
6
:
−3
(5)
−10
:
x
+
5
=
5
:
3
(6)
−2
:
−4
=
30
:
−3
x
(7)
−5
:
−4
=
3
x
:
−48
(8)
−2
:
−3
=
6
:
x
+
5
(9)
2
x
:
20
=
−1
:
5
(10)
3
:
−5
=
−9
:
3
x
(11)
−12
:
15
=
4
:
x
+
5
(12)
−20
:
5
x
=
−10
:
−5
(13)
−12
:
−4
x
=
−2
:
4
(14)
10
:
5
=
−4
:
x
+
3
(15)
−5
:
−
x
=
−10
:
−8
(16)
−2
:
10
=
−1
:
x
−
2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
4
:
2
x
=
−2
:
−8
−2
×
2
x
=
4
×
(
−8
)
x
=
8
(2)
−3
:
3
=
5
:
5
x
−3
×
5
x
=
3
×
5
x
=
−1
(3)
12
:
x
−
5
=
3
:
−5
3
×
(
x
−
5
)
=
12
×
(
−5
)
x
−
5
=
−20
x
=
−15
(4)
−2
:
x
−
2
=
6
:
−3
6
×
(
x
−
2
)
=
−2
×
(
−3
)
x
−
2
=
1
x
=
3
(5)
−10
:
x
+
5
=
5
:
3
5
×
(
x
+
5
)
=
−10
×
3
x
+
5
=
−6
x
=
−11
(6)
−2
:
−4
=
30
:
−3
x
−2
×
(
−3
)
x
=
−4
×
30
x
=
−20
(7)
−5
:
−4
=
3
x
:
−48
−4
×
3
x
=
−5
×
(
−48
)
x
=
−20
(8)
−2
:
−3
=
6
:
x
+
5
−2
×
(
x
+
5
)
=
−3
×
6
x
+
5
=
9
x
=
4
(9)
2
x
:
20
=
−1
:
5
5
×
2
x
=
20
×
(
−1
)
x
=
−2
(10)
3
:
−5
=
−9
:
3
x
3
×
3
x
=
−5
×
(
−9
)
x
=
5
(11)
−12
:
15
=
4
:
x
+
5
−12
×
(
x
+
5
)
=
15
×
4
x
+
5
=
−5
x
=
−10
(12)
−20
:
5
x
=
−10
:
−5
−10
×
5
x
=
−20
×
(
−5
)
x
=
−2
(13)
−12
:
−4
x
=
−2
:
4
−2
×
(
−4
)
x
=
−12
×
4
x
=
−6
(14)
10
:
5
=
−4
:
x
+
3
10
×
(
x
+
3
)
=
5
×
(
−4
)
x
+
3
=
−2
x
=
−5
(15)
−5
:
−
x
=
−10
:
−8
−10
×
(
−1
)
x
=
−5
×
(
−8
)
x
=
4
(16)
−2
:
10
=
−1
:
x
−
2
−2
×
(
x
−
2
)
=
10
×
(
−1
)
x
−
2
=
5
x
=
7