4. Efectuați:
a) (2+2•3)-{2•2²•2⁴³-2⁴⁶+ [3¹⁴⁸: 34³ - (3⁵)²¹] + 16}
b) 122 +12•183: [(2•3²•5³): (2⁴•3⁷-5¹²)+(2⁸)⁹: 2⁷²-1²⁷•5⁰-(54-2²•3)}
urgent!!! dau coroana​