999 + 1000 + 1001 + 1002
=(999+1002)+(1000+1001)
= 2001 + 2001
= 2001 x 2
= 4002
999 + 1000 + 1001 + 1002
= 1999 + 1001 + 1002
= 3000 + 1002
= 4002, nha bạn
1. Tính :999 + 1000 + 1001 + 1002= .(999+1001)+(1000+1002)..........= .....2000...+2002..= ................4002.........................
999+1000+1001+1002
=(999+1002)+(1000+1001)
=2001+2001
=4002
999+1000+1001+1002
=999+1001+1000+1002
=2000+2002
=4002
nhìu nha
= ( 999 + 1001 ) + ( 1000 + 1002 )
= 2000 + 2002
= 4002
