Question

Exercitiile 1, 2 si 3 va rog!​

Answer 1

1) a/b= 1,5

b/c= 6/7 fractie ireductibila si b si c sunt cifre, rezulta ca b= 6, c= 7, a= 1,5*6= 9

abc=967

2) (3/4)*a=(2/3)*b /:[(3/4)*]b

a/b= (2/3):(3/4)=(2/3)*(4/3)=8/9

a/b=8/9

a+b=3,4

a= (8/9)*b

(8/9)*b+b= 3,4

17*b= 3,4*9

17*b=30,6

b=30,6:17

b=1,8

a=3,4-1,8

a=1,6

3)

x,y#0 (numere rationale nenule),

2x=3y /+y

2x+y= 3y+y,

2x+y= 4y, y#0, rezulta 2x+y#0

12x-5y= 6*2x-5y= 6*3y-5y= 18y-5y= 13y

2x+y= 4y

(12x-5y)/(2x+y)= 13y/4y= 13/4