Question

biet 1^3+2^3+.....+10^3 = 3025

tính S = 2^3+4^3+6^3+.....+20^3

Answer 1

S=2^3+4^3+6^3+....+20^3=2^3×(1^3+2^3+3^3+....+10^3)=8×3025=24200