Question

$sqrt{4m^{2} } - sqrt[3]{64m^{3} } - sqrt[4]{625m^{4} } + sqrt[6]{727}$

Answer 1

$2^2=4 \ 3^4=64 \ 5^4=625 \ sqrt{4m^2} -sqrt[3]{64m^3}-sqrt[4]{625m^4} +sqrt[6]{727}=2m-4m-5m+sqrt[6]{727}= \ =-7m+sqrt[6]{727}$