Question

Ma puteti ajuta va rog , si pe mine ?

Answer 1

ab=2/15
ac=11/75
a(b+c)=ab+ac=2/15+11/75=(10+11)/75=21/75=7/25


ac=7/36
bc=19/48
c(b-a)=bc-ac=19/48-7/36=(19*3-7*4)/144=(57-28)/144=29/144

a=5/6 
b+c=7/20
c-d=1/4
ab+2ac-ad=ab+ac+ac-ad=a(b+c)+a(c-d)=a[(b+c)+(c-d)]=5/6(7/20+1/4)=
=5/6(7+5)/20=5/6 * 12 /20 =5/6 *6/10= 5/10=1/2

(a₁+a₂)/2=5
a₁+a₂=5*2=10
(a₃+a₄+a₅)/3=25
a₃+a₄+a₅=25*3=75
(a₆+a₇+a₈+a₉+a₁₀)/5=200
a₆+a₇+a₈+a₉+a₁₀=200*5=1000

a₁+a₂+a₃+a₄+a₅+a₆+a₇+a₈+a₉+a₁₀=10+75+1000=1085
(a₁+a₂+a₃+a₄+a₅+a₆+a₇+a₈+a₉+a₁₀)/10=1085/10=108,5