Question

x.(x+1)=2+4+6+...+2500

Answer 1

x.(x + 1) = 2 + 4 + 6 + ... + 2500

x.(x + 1) = (2500 + 2).[(2500 - 2) : 2 + 1] : 2

x.(x + 1) = 2502.1250 : 2

x.(x + 1) = 1250.1251

\(\Rightarrow\) x = 1250

Answer 2

X=1250

đúng ko ?