A= $3^{2}$ + $6^{2}$ + $9^{2}$ +…+ $30^{2}$ B= $2^{3}$ + $4^{3}$ + $6^{3}$ +…+ $20^{3}$ 13/07/2021 Bởi Katherine A= $3^{2}$ + $6^{2}$ + $9^{2}$ +…+ $30^{2}$ B= $2^{3}$ + $4^{3}$ + $6^{3}$ +…+ $20^{3}$
A=1.3^2+2^2.3^2+…+3^2.10^2 = 3^2(1+2^2+…+10^2) =9.385=3465 B=2^3(1+2^3+…+10^3) =8.3025 =24200 Bình luận
A=1.3^2+2^2.3^2+…+3^2.10^2
= 3^2(1+2^2+…+10^2)
=9.385=3465
B=2^3(1+2^3+…+10^3)
=8.3025
=24200