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Formula (a+b) (a-b)= a la 2 -b la 2
Efectuati (7-4√3)(7+4√3)
Va rog ajutatima


Răspuns :

 (7-4√3)(7+4√3) =49-16*3=49-48=1
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(7-4√3)(7+4√3)=
=7²-(4√3)²
=49-4²×(√3)²
=49-16×3
=49-48
=1