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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)
45
:
−3
x
=
−12
:
4
(2)
x
+
4
:
−2
=
8
:
4
(3)
−100
:
−5
x
=
5
:
−4
(4)
−
x
:
1
=
5
:
1
(5)
−3
:
3
x
=
5
:
10
(6)
−3
x
:
12
=
−25
:
20
(7)
2
x
:
10
=
−1
:
1
(8)
2
:
−5
=
x
+
4
:
−20
(9)
−16
:
−4
=
−5
x
:
25
(10)
10
:
−25
=
−8
:
−4
x
(11)
8
:
2
=
5
x
:
−5
(12)
−10
:
5
=
2
x
:
−2
(13)
3
x
:
30
=
3
:
−15
(14)
2
:
−6
=
x
−
3
:
9
(15)
−15
:
5
=
4
x
:
−4
(16)
−12
:
x
−
2
=
−4
:
−2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
45
:
−3
x
=
−12
:
4
−12
×
(
−3
)
x
=
45
×
4
x
=
5
(2)
x
+
4
:
−2
=
8
:
4
4
×
(
x
+
4
)
=
−2
×
8
x
+
4
=
−4
x
=
−8
(3)
−100
:
−5
x
=
5
:
−4
5
×
(
−5
)
x
=
−100
×
(
−4
)
x
=
−16
(4)
−
x
:
1
=
5
:
1
−1
x
=
5
x
=
−5
(5)
−3
:
3
x
=
5
:
10
5
×
3
x
=
−3
×
10
x
=
−2
(6)
−3
x
:
12
=
−25
:
20
20
×
(
−3
)
x
=
12
×
(
−25
)
x
=
5
(7)
2
x
:
10
=
−1
:
1
2
x
=
10
×
(
−1
)
x
=
−5
(8)
2
:
−5
=
x
+
4
:
−20
−5
×
(
x
+
4
)
=
2
×
(
−20
)
x
+
4
=
8
x
=
4
(9)
−16
:
−4
=
−5
x
:
25
−4
×
(
−5
)
x
=
−16
×
25
x
=
−20
(10)
10
:
−25
=
−8
:
−4
x
10
×
(
−4
)
x
=
−25
×
(
−8
)
x
=
−5
(11)
8
:
2
=
5
x
:
−5
2
×
5
x
=
8
×
(
−5
)
x
=
−4
(12)
−10
:
5
=
2
x
:
−2
5
×
2
x
=
−10
×
(
−2
)
x
=
2
(13)
3
x
:
30
=
3
:
−15
−15
×
3
x
=
30
×
3
x
=
−2
(14)
2
:
−6
=
x
−
3
:
9
−6
×
(
x
−
3
)
=
2
×
9
x
−
3
=
−3
x
=
0
(15)
−15
:
5
=
4
x
:
−4
5
×
4
x
=
−15
×
(
−4
)
x
=
3
(16)
−12
:
x
−
2
=
−4
:
−2
−4
×
(
x
−
2
)
=
−12
×
(
−2
)
x
−
2
=
−6
x
=
−4