Răspuns :
[tex] \frac{ 1^{2} * (1+1)^{2} }{4} = \frac{1* 2^{2} }{4} = 1[/tex]
[tex]\frac{1^{2}*(1+1)^{2}}{4}=\frac{1*2^{2}}{4}=\frac{1*4}{4}=\frac{4}{4}=1[/tex]