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