Question

Efectueaza, in doua moduri calculand si respectiv eliminand parantezele .
a) ( 6 - 2/3 + 1/2 ) - ( 5 - 5/3 + 3/2 ) - ( 3 - 7/3 + 5/2 ) ofer 10 pct pt raspunsul corect Ajutor pls

Answer 1

 ( 6 - 2/3 + 1/2 ) - ( 5 - 5/3 + 3/2 ) - ( 3 - 7/3 + 5/2 ) =
[(6·6-2·2+1·3)/6]-[(5·6-5·2+3·3)/6]-[(3·6-7·2+5·3)/6]=
[(36-4+3)/6]-[(30-10+9)/6]-[(18-14+15)/6]=
35/6-29/6-19/6=6/6-19/6=-13/6

sau
 ( 6 - 2/3 + 1/2 ) - ( 5 - 5/3 + 3/2 ) - ( 3 - 7/3 + 5/2 ) =
6-2/3+1/2-5+5/3-3/2-3+7/3-5/2=
6-5-3-2/3+5/3+7/3+1/2-3/2-5/2=
-2+10/3-7/2=
(-2·6+10·2-7·3)/6=
(-12+20-21)/6=-13/6