B = 2011 x 2012 - 1/2012 x 2010 + 2011 + 1 2/3 x 1 2/5 x 1 2/7 x1 2/9 - 11/3
B = 4046132 - 1005/1006 + 2011 + 7/3 x 11/7 - 11/3
B = 4046132 - 1005/1006 + 2011 + 77/21 - 11/3
B = 4046131,001 + 0
B = 4046131,001
C = 2 2/3 + 5/9 + 4/9 : ( 30% - 1/10 )- 2/9
C = 2 2/3 + 5/9 + 4/9 : ( 30/100 - 1/10 ) - 2/9
C = 2 2/3 + 5/9 + 4/9 : 1/5 - 2/9
C = 2 2/3 + 5/9 + 20/9 - 2/9
C = 29/9 + 20/9 - 2/9
C = 49/9 - 2/9
C = 47/9
CHÚC BN HỌC TỐT !!