Question

Aflati numarul "a" in urmatorul exercitiul:
324+3x{386+[48+2x(5xa-16x50)]}=1.866

Rapid!!! 
Va roggg!!!!

Answer 1

324+3*{386+[5*a-800)]}=1866 3*{386+[5*a-800)]}=1866-324=1542 386+[5*a-800)]=1542:3=514 5*a-800=514+386=900 5*a=900-800=100 5*a=100 a=100:5 a=20 ( * =inmultire , daca nu stiai)