Question

o resultado de 1/2 + 2/5 - 1/3 é igual a:

Answer 1

1/2+2/5-2/3=
=15/30+12/30-20/30=
=27/30-20/30=
=7/30

Answer 2

1/2  + 2/5 =                                             mmc= 2 ; 5 l 2
5+4/10 =  9/10                                                  1 ; 5  l 5
9/10  -  1/3 =  27-10/30                                       1 ; 1 l 10
 [17/10]                           
                                                               mmc= 10 ; 3 l 2
                                                                            5 ; 3 l 3 
                                                                            5 ; 1 l 5
                                                                            1; 1 l 30