Đặt biểu thức là A
=> 4A = 101.102.103.(104 - 100)+...+222615.222616.222617.(222618-222614)
= 101.102.103.104 - 100.101.102.103 +...+ 222615.222616.222617.222618 - 222614.222615.222616.222617
= 222615.222616.222617.222618
=> A = 222615.222616.222617.222618/4