Calculați, aplicând reguli de calcul cu puteri
a) 2²•2⁵:2⁷=
b) (5²•5⁴•5⁵)minus¹=
c) 1 1/3(7 2/3 -5 1/3)=
d) (3 1/5- 1 2/5) :2 7/13+3=​