先化簡,再求值(過程)
先化簡,再求值(過程)
[(m-n/m^2-2mn+n^2)-(mn+n^2/m^2-n^2)]*(mn/n-1),其中m=-√3-2,n=-√3+2
[(m-n/m^2-2mn+n^2)-(mn+n^2/m^2-n^2)]*(mn/n-1),其中m=-√3-2,n=-√3+2
數(shù)學(xué)人氣:680 ℃時間:2020-05-24 02:56:08
優(yōu)質(zhì)解答
[(m-n/m^2-2mn+n^2)-(mn+n^2/m^2-n^2)]*(mn/n-1)={[m-n/(m-n)^2)]-[n(m+n)/(m+n)(m-n)]*(mn/n-1)=[1/(m-n)- n/(m-n)] * mn/(n-1)=(1-n)/(m-n) * mn/(n-1)= -(mn)/(m-n)因為mn =(-√3-2)(-√3+2) = -1m-n = (-√3-2)-...
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