Question

(1-x)+(1-2x)+(1-3x)+(1-4x)+(1-5x)+(1-6x)+(1-7x)+(1-8x)+(1-9x)+(1-10x)=100

Buna ziua. exista o formula pentru asa ceva?
Multumesc.

Answer 1

Explicație pas cu pas:

Nu exista formula, desfiintezi parantezele si rezolvi ecuația

(1-x)+(1-2x)+(1-3x)+(1-4x)+(1-5x)+(1-6x)+(1-7x)+(1-8x)+(1-9x)+(1-10x)=100

-> 1-x+1-2x+1-3x+1-4x+1-5x+1-6x+1-7x+1-8x+1-9x+1-10x=100

->adunam terminii de acelasi fel

->10-55x=100

->-55x=100-10

-> -55x=90

-> x=-90/55

-> x= -18/11