Răspuns:
b)
[tex]=(\frac{9-1}{3} )^{2} +(\frac{4-1}{2} )^{2}-(\frac{3}{2} )^{2}=[/tex]
[tex]=(\frac{8}{3} )^{2}+ (\frac{3}{2} )^{2} -(\frac{3}{2} )^{2}=[/tex]
[tex]=\frac{8^{2} }{3^{2} } =\frac{64}{9}[/tex]
c)
[tex]=\frac{2-1}{2} *\frac{3-1}{3} *\frac{4-1}{4}*\frac{5-1}{5}*...*\frac{49-1}{49}*\frac{50-1}{50}=[/tex]
[tex]=\frac{1}{2}* \frac{2}{3}* \frac{3}{4}* \frac{4}{5}*...* \frac{48}{49}* \frac{49}{50}=[/tex]
[tex]=\frac{1}{50}[/tex]
Explicație pas cu pas:
