ajutooor!!!!!!!!!pliz dau 20 puncte si coroana

Ajutooorpliz Dau 20 Puncte Si Coroana class=

Răspuns :

1.
=
(1²-2√3+√3²)+(1²+2√3+√3²)-(1²-√3²)=
1-2√3+3+1+2√3+3-1+3=10

2.
=
15x-30+12-6x=5x-8
15x-6x-5x=30-12-8
4x=10
x=10:4
x=2,5