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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
[0G0-00]
(1)
10
:
−10
=
−5
:
x
(2)
x
:
−5
=
12
:
−15
(3)
−1
:
−4
=
−4
:
x
(4)
2
:
−2
=
x
:
3
(5)
x
:
−6
=
5
:
−3
(6)
−4
:
−5
=
x
:
−15
(7)
x
:
−12
=
−1
:
4
(8)
1
:
x
=
−1
:
−4
(9)
x
:
1
=
−15
:
−3
(10)
x
:
2
=
2
:
4
(11)
5
:
−25
=
x
:
25
(12)
6
:
−2
=
3
:
x
(13)
x
:
1
=
8
:
4
(14)
x
:
1
=
−25
:
−5
(15)
−4
:
x
=
2
:
1
(16)
x
:
2
=
−4
:
−2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
10
:
−10
=
−5
:
x
10
x
=
−10
×
(
−5
)
x
=
5
(2)
x
:
−5
=
12
:
−15
−15
x
=
−5
×
12
x
=
4
(3)
−1
:
−4
=
−4
:
x
−
x
=
−4
×
(
−4
)
x
=
−16
(4)
2
:
−2
=
x
:
3
−2
x
=
2
×
3
x
=
−3
(5)
x
:
−6
=
5
:
−3
−3
x
=
−6
×
5
x
=
10
(6)
−4
:
−5
=
x
:
−15
−5
x
=
−4
×
(
−15
)
x
=
−12
(7)
x
:
−12
=
−1
:
4
4
x
=
−12
×
(
−1
)
x
=
3
(8)
1
:
x
=
−1
:
−4
−
x
=
−4
x
=
4
(9)
x
:
1
=
−15
:
−3
−3
x
=
−15
x
=
5
(10)
x
:
2
=
2
:
4
4
x
=
2
×
2
x
=
1
(11)
5
:
−25
=
x
:
25
−25
x
=
5
×
25
x
=
−5
(12)
6
:
−2
=
3
:
x
6
x
=
−2
×
3
x
=
−1
(13)
x
:
1
=
8
:
4
4
x
=
8
x
=
2
(14)
x
:
1
=
−25
:
−5
−5
x
=
−25
x
=
5
(15)
−4
:
x
=
2
:
1
2
x
=
−4
x
=
−2
(16)
x
:
2
=
−4
:
−2
−2
x
=
2
×
(
−4
)
x
=
4