Question

Giúp với :

( 21/31 + 2013/6039 ) - ( 44/53 -10/31 ) - 9/53 

Toán Hè 

Hỏi cho voi

Answer 1

bỏ ngoặc: 21/31+2013/6039-44/53+10/31-9/53

ta có ; (21/31+10/31)-(44/53+9/53)+1/3

          1-1+1/3=1/3

Answer 2

(21/31+2013/6039)-(44/53-10/31)-9/53

=21/31+1/3-44/53+10/31-9/53

=(21/31+10/31)-(44/53+9/53)+1/3

=31/31-53/53+1/3

=1-1+1/3

=0+1/3

=1/3!!!

Answer 3

x +30%x=-1,31