Đáp án:
$\dfrac{1}{10^{10}}$
Giải thích các bước giải:
$\dfrac{4^{10}.5^{20}}{10^{30}}$
=$\dfrac{4^{10}.5^{10}.5^{10}}{10^{30}}$
=$\dfrac{(4.5)^{10}.5^{10}}{10^{30}}$
=$\dfrac{20^{10}.5^{10}}{10^{30}}$
= $\dfrac{(20.5)^{10}}{10^{30}}$
=$\dfrac{100^{10}}{10^{30}}$
=$\dfrac{(10^{2})^{10}}{10^{30}}$
= $\dfrac{10^{20}}{10^{30}}$
=$\dfrac{1}{10^{10}}$