Question

Efectuati calculele:
a)15 radical din 7+3 {-4radical din3+5 [2 radical din7+3 (3radical din3-7 )]}
b)2radical din3-7 {8radical din2-4 [5radical din3+3 (4radical din2-3radical din 3)]}

Answer 1

a) 15√7+3 {-4√3+5[2√7+3(3√3-7)]}=
=15√7+3{-4√3+5(2√7+9√3-21)}=
=15√7+3(-4√3+10√7+45√3-105)=
=15√7-12√3+30√7+135√3-315=
=45√7+123√3-315

b)2√3-7{8√2-4[5√3+3(4√2-3√3)]}=
=2√3-7{8√2-4[5√3+12√2-9√3]}=
=2√3-7[8√2-20√3-48√2+36√3]=
=2√3-7(-20√2+16√3)=
=2√3+140√2-112√3=
=140√2-110√3