Question

calculați rădăcina pătrată a numerelor urmatoare: a.23ori5plus23ori18
b.311ori312plus312
c.2plus4plus6plus...plus70plus36
d.1plus3plus5plus...plus31

Answer 1

a) X=23•5+23•18 X=115+414 . X=529 . Radical din 529=23 b) X=311•312+312 X=97032+312 . X=97344 . Radical din97344=312 c)X=2+4+6+.....+70+36 X=2•(1+2+....+35)+36 X=2•(35•36:2)+36 . X=35•36+36 . X=36•(35+1) X=1009•1009=1009 la a doua Radical din 1009 la a doua=|1009|=1009 d) X=1+3+5+...+31 . X=2•(1+2+3+...31)=31•(31+1):2 . X=31•(31+1):2 . X=31•32:2 . X=992:2 . X=496 . Radical din 496=22,27 Coroniță?? :)