Question

f:R-f(x) =2*x-1 a) f(1)+f(2)+...+f(50)​

Answer 1

Răspuns:

f(1)=2*1-1

f(1)=2-1

f(1)=1

f(2)=2*2-1

f(2)=4-1

f(2)=3

f(3)=2*3-1

f(3)=6-1

f(3)=5

f(50)=2*50-1

f(50)=100-1

f(50)=99

Observăm ca merge din 2 in 2

1+3+5+.....+99

1+3+5+.....+2n-1=n*n

99=2n-1

2n=99+1

2n=100

n=100:2

n=50

S=50*50

S=2500

Explicație pas cu pas:

* ori