Question

calculati a×b unde a=1/2×3/4×5/6....19/20 și b=2/3×4/5×6/7....20/21​

Answer 1

Răspuns:

$\frac{366080}{6789783}$

Explicație pas cu pas:

$A=\frac{1}{2} *\frac{3}{4} *\frac{5}{6} *..*\frac{19}{20} = \frac{715}{3584} \\\\ B=\frac{2}{3} *\frac{4}{5} *\frac{6}{7}*..*\frac{20}{21} =\frac{262144}{969969} \\\\A*B=\frac{715}{3584} *\frac{262144}{969969} =\frac{366080}{6789783}$

Sper ca te-am ajutat! Bafta! :)