Question

tính

a=1+1/2x(1+2)+1/3x(1+2+3)+.....+1/21x(1+2+3+4+...+21)

các bạn giải giúp với 

Answer 1

\(A=1+\frac{1}{2}.\left(1+2\right)+\frac{1}{3}.\left(1+2+3\right)+...+\frac{1}{21}.\left(1+2+3+...+21\right)\)

\(A=1+\frac{1}{2}.\frac{\left(1+2\right).2}{2}+\frac{1}{3}.\frac{\left(1+3\right).3}{2}+...+\frac{1}{21}.\frac{\left(1+21\right).21}{2}\)

\(A=1+\frac{3}{2}+\frac{4}{2}+...+\frac{22}{2}\)

\(A=\left(1+11\right).21:2=231\)

Answer 2

sorry, đáp án của mình là 126 nha bạn