√50 * ( 3 √8 - 5 √32 + 7 √50 - 13 √72 =


Răspuns :

=5√2*(3*2√2-5*4√2+7*5√2-13*6√2)=5√2*(6√2-20√2+35√2-78√2)=5√2*(-57√2)=-285*√2*√2=-570