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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
:
2
=
−1
:
x
−
2
(2)
−4
x
:
−16
=
9
:
−3
(3)
−1
:
1
=
3
x
:
6
(4)
3
x
:
−15
=
−3
:
5
(5)
−10
:
−2
x
=
−5
:
10
(6)
−5
:
−25
=
−3
:
x
+
2
(7)
−2
:
−4
=
x
+
3
:
10
(8)
−5
:
x
−
3
=
−1
:
2
(9)
x
−
4
:
−1
=
3
:
1
(10)
−3
:
−2
=
18
:
−2
x
(11)
−1
:
1
=
x
+
3
:
3
(12)
1
:
2
=
−1
:
x
+
3
(13)
16
:
20
=
x
−
2
:
−5
(14)
−2
:
x
−
4
=
−4
:
−6
(15)
3
:
−2
=
−12
:
x
−
4
(16)
4
:
−12
=
−3
:
−
x
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−2
:
2
=
−1
:
x
−
2
−2
×
(
x
−
2
)
=
2
×
(
−1
)
x
−
2
=
1
x
=
3
(2)
−4
x
:
−16
=
9
:
−3
−3
×
(
−4
)
x
=
−16
×
9
x
=
−12
(3)
−1
:
1
=
3
x
:
6
3
x
=
−
6
x
=
−2
(4)
3
x
:
−15
=
−3
:
5
5
×
3
x
=
−15
×
(
−3
)
x
=
3
(5)
−10
:
−2
x
=
−5
:
10
−5
×
(
−2
)
x
=
−10
×
10
x
=
−10
(6)
−5
:
−25
=
−3
:
x
+
2
−5
×
(
x
+
2
)
=
−25
×
(
−3
)
x
+
2
=
−15
x
=
−17
(7)
−2
:
−4
=
x
+
3
:
10
−4
×
(
x
+
3
)
=
−2
×
10
x
+
3
=
5
x
=
2
(8)
−5
:
x
−
3
=
−1
:
2
−
(
x
−
3
)
=
−5
×
2
x
−
3
=
10
x
=
13
(9)
x
−
4
:
−1
=
3
:
1
x
−
4
=
−
3
x
−
4
=
−3
x
=
1
(10)
−3
:
−2
=
18
:
−2
x
−3
×
(
−2
)
x
=
−2
×
18
x
=
−6
(11)
−1
:
1
=
x
+
3
:
3
x
+
3
=
−
3
x
+
3
=
−3
x
=
−6
(12)
1
:
2
=
−1
:
x
+
3
x
+
3
=
2
×
(
−1
)
x
+
3
=
−2
x
=
−5
(13)
16
:
20
=
x
−
2
:
−5
20
×
(
x
−
2
)
=
16
×
(
−5
)
x
−
2
=
−4
x
=
−2
(14)
−2
:
x
−
4
=
−4
:
−6
−4
×
(
x
−
4
)
=
−2
×
(
−6
)
x
−
4
=
−3
x
=
1
(15)
3
:
−2
=
−12
:
x
−
4
3
×
(
x
−
4
)
=
−2
×
(
−12
)
x
−
4
=
8
x
=
12
(16)
4
:
−12
=
−3
:
−
x
4
×
(
−1
)
x
=
−12
×
(
−3
)
x
=
−9