Question

x.1 +x.2+x.3+...+x.99=495                     trả lời hộ mink nhé

 

Answer 1

\(x.1+x.2+x.3+....+x.99=495\)

<=> \(x.\left(1+2+3+...+99\right)=495\)

<=> \(x.\left\{\left(99+1\right).\left[\left(99-1\right):1+1\right]:2\right\}=495\)

<=> \(x.4950=495\)

<=> \(x=\frac{495}{4950}=\frac{1}{10}\)

Answer 2

 

x.1 +x.2+x.3+...+x.99=495             

=>x.(1+2+3+...+99)=495

=>x.\(\frac{\left(1+99\right).99}{2}=495\)

 =>x.4950=495

=>x=\(\frac{495}{4950}\)

=>x=1/10