Question

em notação científica , de produto 0,000000000023 . 0,000000000054

Answer 1

a)  1,25 x 
b)  2,11 x 
c) 7,3 x 
d) 1,5 x 

Answer 2

$0,000000000023\cdot0,000000000054=\\ (23\cdot10^{-12})\cdot(54\cdot10^{-12})=\\ (23\cdot54)\cdot(10^{-12}\cdot10^{-12})=\\ 1242\cdot10^{-24}=\\ 1,242\times10^{-24+3}=\\\\ \boxed{\boxed{1,242\times10^{-21}}}$