Question

calculați 10 factorial supra 8 factorial,

11 factorial - 9 factorial supra 10 factorial +9 factorial​

Answer 1

Răspuns:

10!/8!=8!9×10/8!=90

11!-9!/10!+9!=11!-9!/(9!×10)+9!=

11!-1/10+9!=11!+9!-1/10=11!+(9!×10-1)/10=

11!+(10!-1)/10