[(2m+n)^2+(2m+n)(2m-n)]/2m,其中m=3,n=1/2化简求值!
问题描述：
[(2m+n)^2+(2m+n)(2m-n)]/2m,其中m=3,n=1/2化简求值!
答
13，
(2m n )• (2m n 2m~n)•1/2m= (2m n )•2=13
答
原式=[4m^2+4mn+n^2+4m^2-n^2]/(2m)
=(8m^2+4mn)/(2m)
=4m+2n
=4*3+2/2=13 .