Exercitiu C rapid dau coroana

0,8(3)=83-8/90=75/90=15/18=5/6

[5/6-5/8]:{(5/6)²-(5/6)*(5/8)+(5/8)²}

[(20-15)/24]:[(25/36)-(25/48)+(25/64)] in paranteza patrata numitor comun1728

(5/24):[(1200-900+675)/1728]

(5/24)x(1728/975)=72/195=24/65

c )

0,8(3) = ( 83 - 8 ) / 90 = 75 / 90 = 15 / 18 = 5 / 6

( 5 / 6 - 5 / 8 ) : [ ( 5 / 6 )² - 5 / 6 x 5 / 8 + ( 5 / 8 )² ] =

= ( 20 / 24 - 15 / 24 ) : ( 25 / 36 - 25 / 48 + 25 / 64 ) =

= 5 / 24 : ( 1600 / 2304 - 1200 / 2304 + 900 / 2304 ) =

= 5 / 24 : 1 300 / 2304 =

= 5 / 24 x 2304 / 1300 =

= 96 / 260 =

= 24 / 65