f(x) =-2x+3/2
Punw em conditia:
f(a)=-1/2
adica
-2a+3/2=-1/2
-2a=-3/2-1/2=-4/2=-2
2a=2
a=1
f(x) =-2x+3/2
f(1) =-2*1+3/2
f(2) =-2*2+3/2
f(3( =-2*3+3/2
..........................
f(50)n =-2*50 +3/2
Jmekeria e sa NU LE CALCULEZI inca, sa le lasi asa
deci
suma =f(1)+f(2) +....+f(50)= -2 ( 1+2+3+...+50) + 3/2+3/2+...+3/2 de 50 de ori
suma = (-2) *50*51/2+3*50/2=
= -50*51 +75=
=-2550+75= -2500+25=-2475