(1+1/m)÷m²-1/m²-2m+1

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(1+1/m)÷m²-1/m²-2m+1

(1+1/m)÷m²-1/m²-2m+1
(1+1/m)÷m²-1/m²-2m+1

(1+1/m)÷m²-1/m²-2m+1
(1+1/m)÷m²-1/m²-2m+1
=(m+1)/m×(m-1)²/(m+1)(m-1)
=(m-1)/m