Question

Tính nhanh:  A = ( 1² + 2² + 3² + 4² + ..... + 2014² ) x ( 65 x 111 - 13 x 15 x 37 )

Answer 1

A = (1²+2²+3²+...+2014²)x(65x111-13x3x5x37)

A = (1²+2²+32+...+2014²)x(65x111-65x111)

A = (1²+2²+3²+...+2014²)x0

A = 0