4m²-4m+1/m+1÷4m²-1/m²-1
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4m²-4m+1/m+1÷4m²-1/m²-14m²-4m+1/m+1÷4m²-1/m²-14m²-4m+1/m+1÷4m
4m²-4m+1/m+1÷4m²-1/m²-1
4m²-4m+1/m+1÷4m²-1/m²-1
4m²-4m+1/m+1÷4m²-1/m²-1
(4m²-4m+1)/(m+1)÷(4m²-1)/(m²-1)
=(2m-1)²/(m+1)×(m+1)(m-1)/(2m+1)(2m-1)
=(2m-1)(m-1)/(2m+1)
=(2m²-3m+1)/(2m+1)