Question

đúng ,sai?

Answer 1

`(8/15)^2 . (-5/4)^3`

`= 64/225 . -125/64`

`= -125/225`

`= -5/9`

`e, |x| >=0 forall x in RR`.

Dấu bằng xảy ra `<=> x= 0`.

`-> x ne 0 -> |x| > 0`

`->` Đúng

Answer 2

 

\(\left(\dfrac{8}{15}\right)^2.\left(-\dfrac{5}{4}\right)^3\)

\(=\dfrac{64}{225}.-\dfrac{125}{64}\)

\(=-\dfrac{5}{9}\)

\(e,\) Đúng