Comb de4 luate cate 0=comb de 4 luate cate 4=1
Comb de 4 luuate catre 1=Combde 4 luate cate3=4
Comb de 4 luate cate 2=4*3/2=6
Coef binom miali
1 4 6 4 1
(1+√4)^4=(1+2)^4=3^4=81
cu Newton:
(1+2)^4=1*1^4+4*1³*2+6*1²*2²+4*1*2³+2^4=1+8+24+32+16=33+32+16=
=65+16=81
as simple as that!!
am adaugat si b)