约分.(1)a-1/a+1=___ (2)m^2-4mn+4n^2/m^2+4mn+4n^2=____
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约分.(1)a-1/a+1=___ (2)m^2-4mn+4n^2/m^2+4mn+4n^2=____
(3)x^2-y^2/x+y=____ (4)x^2+y^2+2xy/x^2-y^2=____
(3)x^2-y^2/x+y=____ (4)x^2+y^2+2xy/x^2-y^2=____
(1)(a-1)/(a+1)= (a-1)/(a+1)
(2)(m^2-4mn+4n^2)/(m^2+4mn+4n^2)
= (m-2n)^2/(m+2n)^2
(3)(x^2-y^2)/(x+y)
= (x-y)(x+y)/(x+y)
= x-y
(4)(x^2+y^2+2xy)/(x^2-y^2)
=(x+y)^2/[(x+y)(x-y)]
=(x+y)/(x-y)
(2)(m^2-4mn+4n^2)/(m^2+4mn+4n^2)
= (m-2n)^2/(m+2n)^2
(3)(x^2-y^2)/(x+y)
= (x-y)(x+y)/(x+y)
= x-y
(4)(x^2+y^2+2xy)/(x^2-y^2)
=(x+y)^2/[(x+y)(x-y)]
=(x+y)/(x-y)
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