计算分式乘除1、x^2-2x+1/x^2 2、2/2a+3+3/2a-3 3、x^2-2x+1/x^2-1÷x-1/x^2+x1、(x^2-2x+1)/(x^2 ) 2、(2/2a+3)+(3/2a-3)+(2a+15)/(4a^2-9)3、(x^2-2x+1)/(x^2-1)÷(x-1)/(x^2+x)

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