Aduceti la forma cea mai simpla:√3·(3√3-2√27)+√225-√441=

Răspuns :

√3·(3√3-2√27)+√225-√441=

= 3√9 - 2√81 + 15 - 21 =

= 3 × 3 - 2 × 9 + 15 - 21 =

= 9 - 18 - 6 =

= - 9 - 6 =

= - 15

=√3(3√3-2*3√3)+15-21
=3*3-2*3*3+15-21
=9-18+15-21
=-15