Question

Fie f:R->R, f(x)= 5-x. Sa se calculeze f(1)•f(2)•f(3)•...•f(10).

Answer 1

f(1)=5-1=4
f(2)=5-2=3
f(3)=5-3=2
f(4)=5-4=1
f(5)=5-5=0
..........
..........
..........
f(10)=5-10=-5

f(1)*f(2)*f(3)*..*f(10)=
=4*3*2*1*0*...*(-5)
=>(orice numar inmultit cu 0 ne da 0, deci)

f(1)*f(2)*f(3)*..*f(10)= 0

Answer 2

f:R->R, f(x)= 5-x
este necesar doar sa calculezi f(5). f(5) = 5-5 => f(5) = 0

f(1)•f(2)•f(3)•f(4)•0•...•f(10) = 0