2 câu trả lời
Đáp án:
$\dfrac{ (-3)^2 .27. 625 }{(-25)^3 .81}$
$= \dfrac{ (-3)^2 .3^3. 25^2 }{(-25)^3 .3^4}$
$= \dfrac{ 3^2 .3^3. 25^2 }{(-25).25^2 .3^4}$
$ =\dfrac{ 3^4.3. 25^2 }{(-25).25^2 .3^4}$
$= \dfrac{3}{-25}= \dfrac{-3}{25}$
$\dfrac{\left(-3\right)^2\times \:27\times \:625}{\left(-25\right)^3\times \:81}$
$=\dfrac{\left(-3\right)^2\times \:27\times \:625}{\left(-25\right)^3\times \:27\times \:3}$
$=\dfrac{\left(-3\right)^2\times \:625}{\left(-25\right)^3\times \:3}$
$=\dfrac{3\times \:625}{\left(-25\right)^3}$
$=-\dfrac{3}{25}$
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