(1+1/m)÷m²-1/m²-2m+1
问题描述:
(1+1/m)÷m²-1/m²-2m+1
答
(1+1/m)÷m²-1/m²-2m+1
=(m+1)/m×(m-1)²/(m+1)(m-1)
=(m-1)/m