Question

Tìm x thuộc N 

(x+2)+(x+4).......(x+48) +(x+50)=750

Answer 1

(x + 2) + (x + 4) + ... + (x + 50) = 750

=> 15x + 390 = 750

=> 15x = 360

=> x = 24

vậy_

Answer 2

\(\left(x+2\right)+\left(x+4\right)+...+\left(x+48\right)+\left(x+50\right)=750\)

\(\Rightarrow\left(x+x+...+x\right)+\left(2+4+6+....+50\right)=750\)

\(\Rightarrow25x+650=750\)

\(\Rightarrow25x=100\Rightarrow x=4\)