1.Calcule x , nas proporções
a)x/2=30/4
b)4/5=x/20
c)20/4=x/2
d)8/32=2/x
e)6/x=3/9
2.Calcule a razão entre :
a)21 e 14
b)15 e 12
c)18 e 12
d)20 e 8
a)x/2=30/4
b)4/5=x/20
c)20/4=x/2
d)8/32=2/x
e)6/x=3/9
2.Calcule a razão entre :
a)21 e 14
b)15 e 12
c)18 e 12
d)20 e 8
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Verified answer
a)x/2=30/4x = 30
---- -----
2 4
4x = 2.30
4x = 60
x = 60/4
x = 15
*************************
b)4/5=x/20
4 = x
------ ------
5 20
4.20 = 5x
80 = 5x
5x = 80
x = 80/5
x = 16
******************************
c)
20/4=x/2
20 = x
------ -----
4 2
5 = x
-----
2
5.2 = x
10 = x
x = 10
***********************
d)
8/32=2/x
8 = 2
----- -----
32 x
8x = 2.32
8x = 64
x = 64/8
x = 8
***********************
e)
6/x=3/9
6 3
---- = ----
x 9
6.9 = 3x
54 = 3x
3x = 54
x = 54/3
x = 18
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
a)21 e 14
21 (:7) 3
----- = -----
14 (:7) 2
************************
b)15 e 12
15 (:3) 5
----- = ------
12 (:3) 4
****************************
c)18 e 12
18 (:6) 3
------ = ------
12 (:6) 2
****************************
d)20 e 8
20 (:4) 5
----- = -----
8 (:4) 2
***************************
a) x/2 = 30/4
4x = 30.2
4x = 60
x = 60/4
x = 15
b) 4/5 = x/20
5x = 4.20
5x = 80
x = 80/5
x = 16
c) 20/4 = x/2
x/2 = 5
x = 5.2
x = 10
d) 8/32 = 2/x
8x = 32.2
8x = 64
x = 64/8
x = 8
e) 6/x = 3/9
3x = 9.6
3x = 54
x = 54/3
x = 18
2°
a) 21 e 14
21/14 = 3/2
b) 15 e 12
15/12 = 5/4
c) 18 e 12
18/12 = 3/2
d) 20 e 8
20/8 = 5/2