Question

Efecruati calculele a)15 rad 7 +3 {-4 rad 3+5[ 2 rad 7+3 (3 rad 3-7 ) ] }
b)2 rad 3 - 7{8 rad 2-4[5 rad 3+3(4 rad 2- 3 rad 3)] :8}

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=

=3(15√7+41√3-105)

b)2√3-7{8√2-4[5√3+3(4√2-3√3)]:8}=

=2√3-7{8√2-4[5√3+12√2-9√3]:8}=

=2√3-7{[8√2-20√3-48√2+36√3]:8}=

=2√3-7{[-40√2+16√3]:8}=

=2√3-7(2√3-5√2)=

=2√3-14√3+35√2=

=35√2-12√3