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