Question

efectuati utilizand formulele calculului prescurtat a) (2a-3)(2a+3) b) (m-2n)-totul la patrat c) (2-3a)(2+3a) d) (4m+n)-totul la patrat

Answer 1

a) (2a-3)(2a+3)= (2a)²-3² =4a²-9
b) (m-2n)²= m²-2·m·2n+(2n)² = m²-4mn+4n²
c) (2-3a)(2+3a)= 2²- (3a)² = 4-9a²
d) (4m+n)² = (4m)²+2·4m·n+n² = 16m²+8mn+n²
sper ca ti-am fost de folos!:)

Answer 2

(2a-3)(2a+3)=(2a)²-3²=4a-9
(m-2n)²=m²-2*m*2n+(2n)²             
         =m²-4*m*n+4n²
(2-3a)(2+3a)²=2²-(3a)²=4-9a²
(4m+n)²=(4m)²+2*4m*n+n²              
          =16m²+8*m*n+n²