so sanh A va B voi 0
A = 1. ( - 2 ) . 3 . ( - 4 ) ..... . 99 . ( -100 )
B = 1 . ( - 2 ) . 3 . ( - 4 ) . ... . (-98) . 99
So sanh A va B
A=(1+3+5+.......+99) / 50
B=( 2+4+6+.....+98)/ 49
so sanh A va B cho A=1+1+4^2+...+4^99;B=4^100
A=99^2015+1/99^2014+1
B=99^2014+1/99^2013+1
so sanh a va b
So sanh
A =1/50+1/51+1/52+...+1/99
B =1/2
A=2020^100-1:2020^99+1 so sanh a va b
B=2020^101-1:2020^100+1
A=1/2.3/4......199/200 so sanh A voi 1/10 va 1/20
1/51+1/52+1/53+...1/99+1/100 hay so sanh voi 1/2
so sanh: Va tim x
(x-1) Va (x-1)+2 (voi x >o)
