Bài 1 :
a) $\frac{17}{2}$
b) $\frac{39}{4}$
c) 101382830
101201
d) 35603864
35597863
Bài 2 :
B = ( 1 - 1/2 ) × ( 1 - 1/3 ) × ( 1 - 1/5 ) × ( 1 - 1/2009 ) × ( 1-1/2020 )
B = 1/2 x 2/3 x 4/5 x 2008/2009 x 2019/2020
B = 1/3 x 8032/10045 x 2019/2020
B = 8032/30135 x 2019/2020
B = 0,2664019832
E = 5 9/10 : 3/2 - (2 1/3 × 4 1/2 - 2 × 2 1/3 ) : 7/4
E = 59/15 - ( 21/2 - 14/3 ) : 7/4
E = 59/15 - 35/6 : 7/4
E = 59/15 - 10/3
E = 3/5
CHÚC BN HỌC TỐT!!!!!