Ta có :
2 + 4 + 6 + .....+ 100
= {[(100 - 2) : 2 + 1 ] . (100 + 2) : 2 }
= 2550
=> (2+4+6+...+100). (36.333-108.111)
= 2550 . 0
= 0
(2+4+6+..+100).(36.333-108.111)
=(2+4+6+..+100).(36.111.3-36.3.111)
=(2+4+6+..+100).0
=0
(2+4+6+...+100).(36.333-108.111 )
=(2+4+6+...+1000).(36.3.111-108.111)
=(2+4+6+...+1000.(108.111-108.111)
=(2+4+6+...+100).0
= 0