Question

f: r->r , f(x) = 3x-1/2 . calculati suma s=f(1) + f(2) +.............+f(10)​

Answer 1

Răspuns:

Explicație pas cu pas:

f(1)=3x1-1/2

f(2)=3x2-1/2

..

f(10)=3x10-1/2

S=f(1)+f(2)+...+f(10)

S=(3x1-1/2)+(3x2-1/2)+...+(3x10-1/2)

S=3x(1+2+...+10)-10x1/2

S=3x[10(10+1):2]-10/2

S=3x55-5

S=165-5

S=160