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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)
−2
:
x
+
2
=
−4
:
2
(2)
−100
:
4
x
=
20
:
−4
(3)
−2
:
3
=
−6
:
−
x
(4)
8
:
4
x
=
−5
:
−15
(5)
−6
:
9
=
2
:
−
x
(6)
−2
:
−10
=
−5
:
x
−
1
(7)
2
:
x
−
1
=
−2
:
1
(8)
2
:
1
=
4
:
x
+
4
(9)
12
:
−3
=
4
x
:
−4
(10)
−5
:
−2
=
x
−
2
:
10
(11)
3
:
15
=
−4
:
x
+
2
(12)
10
:
−5
x
=
1
:
2
(13)
−3
:
4
=
x
+
2
:
20
(14)
−2
:
−5
=
x
+
4
:
15
(15)
−8
:
10
=
x
−
3
:
−5
(16)
5
:
1
=
25
:
x
−
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−2
:
x
+
2
=
−4
:
2
−4
×
(
x
+
2
)
=
−2
×
2
x
+
2
=
1
x
=
−1
(2)
−100
:
4
x
=
20
:
−4
20
×
4
x
=
−100
×
(
−4
)
x
=
5
(3)
−2
:
3
=
−6
:
−
x
−2
×
(
−1
)
x
=
3
×
(
−6
)
x
=
−9
(4)
8
:
4
x
=
−5
:
−15
−5
×
4
x
=
8
×
(
−15
)
x
=
6
(5)
−6
:
9
=
2
:
−
x
−6
×
(
−1
)
x
=
9
×
2
x
=
3
(6)
−2
:
−10
=
−5
:
x
−
1
−2
×
(
x
−
1
)
=
−10
×
(
−5
)
x
−
1
=
−25
x
=
−24
(7)
2
:
x
−
1
=
−2
:
1
−2
×
(
x
−
1
)
=
2
x
−
1
=
−1
x
=
0
(8)
2
:
1
=
4
:
x
+
4
2
×
(
x
+
4
)
=
4
x
+
4
=
2
x
=
−2
(9)
12
:
−3
=
4
x
:
−4
−3
×
4
x
=
12
×
(
−4
)
x
=
4
(10)
−5
:
−2
=
x
−
2
:
10
−2
×
(
x
−
2
)
=
−5
×
10
x
−
2
=
25
x
=
27
(11)
3
:
15
=
−4
:
x
+
2
3
×
(
x
+
2
)
=
15
×
(
−4
)
x
+
2
=
−20
x
=
−22
(12)
10
:
−5
x
=
1
:
2
−5
x
=
10
×
2
x
=
−4
(13)
−3
:
4
=
x
+
2
:
20
4
×
(
x
+
2
)
=
−3
×
20
x
+
2
=
−15
x
=
−17
(14)
−2
:
−5
=
x
+
4
:
15
−5
×
(
x
+
4
)
=
−2
×
15
x
+
4
=
6
x
=
2
(15)
−8
:
10
=
x
−
3
:
−5
10
×
(
x
−
3
)
=
−8
×
(
−5
)
x
−
3
=
4
x
=
7
(16)
5
:
1
=
25
:
x
−
4
5
×
(
x
−
4
)
=
25
x
−
4
=
5
x
=
9