先化简,再求值!(m-n-(4mn)/(n-m))(m+n-(4mn)/(m+n)),其中m=根号3,n=2

问题描述:

先化简,再求值!
(m-n-(4mn)/(n-m))(m+n-(4mn)/(m+n)),其中m=根号3,n=2

(m-n-(4mn)/(n-m))(m+n-(4mn)/(m+n))=[m-n+(4mn)/(m-n)] [(m+n-(4mn)/(m+n)]=[4mn+(m-n)(m-n)] [(m+n)(m+n)-4mn] / [(m-n)(m+n)]=[(m+n)(m+n)] [(m-n)(m-n)] / [(m-n)(m+n)]=(m+n)(m-n)=m平方-n平方把m=根号...