dau coroana
a) -7•(+3)^2•(2)^3:(-6)
b)[(-3)^7•(+3)^8-(-2)^30]:{-3^15-[(-2)^5]^6}
c)(5^30):(-5)^7 -25^60:(-25)^45:(+5)^7
semnul acesta ^ inseamna la putere
a)=-7*9*8:(-6)=-504:(-6)=+84 b) =[(-3)^15-2^30]:{-3^15-2^30]=1 c) =(-5^23-(5^2)60:(-5^2)^45:5^7= (-5)^23-5^120:(-5)^90:5^7= (-5)^23-5^30:5^7= (-5)^23-5^23=1
