(4m-n)/(2√m+√n)-√n=(2√m-√n)*(2√m+√n)/(2√m+√n)-√n=
=2√m-√n-√n=2√m-2√n=2*(√m-√n)=2*5=10.
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(4m-n)/(2√m+√n)-√n=(2√m-√n)*(2√m+√n)/(2√m+√n)-√n=
=2√m-√n-√n=2√m-2√n=2*(√m-√n)=2*5=10.