Question

9.Calculați
doar a,b,c

Answer 1

Explicație pas cu pas:

a ) 2√3 / 3 - ( 5 / √3  ) =

= 2√3 / 3 - ( 5√3  / 3 )

= - 3√3 / 3

= - √3

b ) ( 2√6 )⁻¹ + 2 / √3 =

= 1 / 2√6 + ( 2 / √3 )

= √6 / 12 + ( 2√3 / 3 )

c ) ( 4√5 / 5 - 3 / 2√5 ) : ( -√20 / 3 ) =

= ( 4√5 / 5 - 3√5 / 2·5 ) : ( -√20 / 3 )

= 4√5 / 5 - 3√5 / 10 : ( -√20 / 3 )

= 8√5 / 10 - 3√5 / 10 : ( -√20 / 3 )

= 5√5 / 10 : ( -√20 / 3 )

= √5 / 2 : ( -√20 / 3 )

= -√5 / 2 : √20 / 3

= -√5 / 2 · 3 / √20

= -3 / ( 2 · √4 )

= -3 / ( 2 · 2 )

= -3 / 4