(1+m分之1)÷m²-2m+1分之m²-1

问题描述:

(1+m分之1)÷m²-2m+1分之m²-1

原式=(m+1)/m×(m-1)²/(m+1)(m-1)
=(m+1)/m×(m-1)/(m+1)
=(m-1)/m