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Calculati : √15 * (6√20-√45)+√21*(√63-2√112)
√6*(4√27-4√12)+√14*(3√28-3√63)
Va rog , e urgent !!!!


Răspuns :

√15*(6*2√5-3√5)+√21*(3√7-2*4√7)=
=√15*9√5+√21*(-5√7)=
=9√75-5√147=
=9*5√3-5*7√3=
=10√3
√6·(4√27-4√12)+√14·(3√28-3√63)=
=√6·(4·3√3-4·2√3)+√14·(3·2√7-3·3√7)=
=√6·4√3+√14·(-3√7)=
=4√18-3√98=
=4·3√2-3·7√2=
= -9√2
sper ca te-am ajutat