Question

va rog repede trebuie sa imi termin lectiile​

Answer 1

Răspuns:

Explicație pas cu pas:

a)

3x/28 = 4,5/4

3x*4 = 28*4,5

12x = 126

x = 126/12 = 10,5

b)

2x/(7/3) = 9/(21/4)

2x*21/4 = 9*7/3

x*21/2 = 21

x = 2*21/21 = 2

c)

0,3/0,4 = 1,35/0,3x

0,3*0,3x = 0,4*1,35

0,09x = 0,54

x = 0,54 : 0,09 = 6

d)

2x/(2/15) = (1/15)/0,2

0,2*2x = 2/15*1/15

0,4x = 2/225

x = (2/225) : 0,4 = 0,0(2)

e)

7x/42 = 15/9

x/6 = 5/3

x = 6*5/3 = 30/3 = 10

f)

4x/31 = 44/41

41*4x = 31*44

x = 31*44/41*4 = 31*11/41 = 341/41

g)

(1/6)/(7/3) = 3,25x/1,3

1,3*1/6 = 3,25x*7/3

13/10*1/6 = 325x/100*7/3

13/60 = 2275x/300

x = 13*300/2275*60 = 3900/136500 = 39/1365