Calculați:b)[(3-5¹⁵:8¹⁰)¹⁷•16²]:(2•2²•4²)³;
c)[5²¹:(1+8¹⁰:4¹⁴)¹⁹-1]:(4¹⁵:8⁹);
d)[(7-2⁵•8⁷:4¹³):3+1]⁴⁹:[(9²)³]⁴.
Urgent.​