Question

Rezolvati in R ecuatiile:
(1-x)+(1-2x)+(1-3x)+....+(1-10x)=30

Answer 1

Răspuns:

1-x+1-2x+1-3x+...+-10x=30

(1+1+1+...1)(de 10  ori)-(x+2x+3x+...+10x)=30

10-x(1+2+3+...+10)=30

-x*10*11/2=30-10

-55x=20

x=20/(-55)

x=-4/11

Explicație pas cu pas: