Question

va implor! am nevoie pana la 12:50

Answer 1

a). 924/1092(prin 12) = 77/91(prin 7) = 11/13

b). deoarece sunt inmultiri simplifici numerele scazand puterile:

2 la puterea 7-5

3 la puterea 7-5

7 la puterea 4-2

deci iti raman:  (2^2 * 7^2)/3^2 = (4*49)/9= 196/9

c). = 6666/(4444+5555+6666) = 1/9999

d). Sn= n(a1+an)/2

an=a1+(n-1)r

n=524

a1=2

an=2+(524-1)*2=1048

Sn=524(2+1048)/2= (524*1050)/2= 524*525=275100

n=786

a1=3

an=3+(786-1)*3=2358

Sn=786(3+2358)/2=(786*2361)/2=393*2361=927873

275100/927873(prin 3) = 91700/309291