Question

notação científica

0,0025x10^-18​

Answer 1

$2.5 \times 10 {}^{ - 3} \times 10 {}^{ - 18} \\ \\ 2.5 \times 10 {}^{( - 3) + ( - 18)} \\ \\ \\ 2.5 \times 10 {}^{ - 3 - 18} \\ \\ 2.5 \times 10 {}^{ - 21}$