约分(1) -x-1÷x²+2x+1 (2)4m²n²÷m²n²-4mn+4
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![约分(1) -x-1÷x²+2x+1 (2)4m²n²÷m²n²-4mn+4](/uploads/image/z/2678458-58-8.jpg?t=%E7%BA%A6%E5%88%86%EF%BC%881%EF%BC%89+-x-1%C3%B7x%26%23178%3B%2B2x%2B1+%EF%BC%882%EF%BC%894m%26%23178%3Bn%26%23178%3B%C3%B7m%26%23178%3Bn%26%23178%3B-4mn%2B4)
约分(1) -x-1÷x²+2x+1 (2)4m²n²÷m²n²-4mn+4
约分(1) -x-1÷x²+2x+1 (2)4m²n²÷m²n²-4mn+4
约分(1) -x-1÷x²+2x+1 (2)4m²n²÷m²n²-4mn+4
(-x-1)÷(x²+2x+1)
=-(x+1)÷(x+1)²
=-1/(x+1)
(4-m²n²)÷(m²n²-4mn+4)
=(4-m²n²)/(m²n²-4mn+4)
=-(m²n²-4)/(m²n²-4mn+4)
=-(mn-2)(mn+2)/(mn-2)²
=-(mn+2)/(mn-2)